Why does water expand when it freezes?
💧 On heating, liquids expand since the molecules move with greater energy overcoming the intermolecular attraction. On the contrary, liquids usually contract on cooling. But that is not the case with water.
💧 The water molecules consist of 2 atoms of hydrogen and one of oxygen, the oxygen atom side being slightly negative, while the hydrogen atoms side – slightly positive, forming hydrogen bonds. Upon freezing, the molecules set themselves in a very open arrangement that contains more space than the water in the liquid state. Hence, water expands upon freezing and becomes less dense. On the other hand, it contracts on thawing, much unlike most other liquids.
💧 Water expands approximately by about 10%.
ℹ️ Water is not the only substance that expands when it freezes, other substances are plutonium, germanium, bismuth, gallium, silicon, etc.
✍️ This phenomenon, the anomalous expansion of water, also explains why ice is floating in water.
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💧 On heating, liquids expand since the molecules move with greater energy overcoming the intermolecular attraction. On the contrary, liquids usually contract on cooling. But that is not the case with water.
💧 The water molecules consist of 2 atoms of hydrogen and one of oxygen, the oxygen atom side being slightly negative, while the hydrogen atoms side – slightly positive, forming hydrogen bonds. Upon freezing, the molecules set themselves in a very open arrangement that contains more space than the water in the liquid state. Hence, water expands upon freezing and becomes less dense. On the other hand, it contracts on thawing, much unlike most other liquids.
💧 Water expands approximately by about 10%.
ℹ️ Water is not the only substance that expands when it freezes, other substances are plutonium, germanium, bismuth, gallium, silicon, etc.
✍️ This phenomenon, the anomalous expansion of water, also explains why ice is floating in water.
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👍18❤9🆒3✍1
What is the most isolated location on Earth?
Nowhere on Earth one can find a place further from dry land than Point Nemo.
It is also known as “the oceanic pole of inaccessibility”, and is located at the point of coordinates 48°52.6′S 123°23.6′W in the South Pacific Ocean, approximately 2,688 km (1,670 ml) away from the nearest land.
Geographically, it is located at the intersection of the equator, the International Date Line, and the 90th meridian west.
The nearest islands to Point Nemo are unpopulated: the Pitcairn Islands’ Ducie Island to the north; Motu Nii, a small island that is part of the Easter Island chain, to the northeast, and Maher island, off the shore of Marie Byrd Land, an unclaimed territory in Antarctica, to the south.
To find the closest hint of civilization, one should travel by boat during more than two weeks to one of the world’s most isolated inhabited islands, Easter Island, which is located about 3,540 km (2,200 ml) to the west of Chile.
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Nowhere on Earth one can find a place further from dry land than Point Nemo.
It is also known as “the oceanic pole of inaccessibility”, and is located at the point of coordinates 48°52.6′S 123°23.6′W in the South Pacific Ocean, approximately 2,688 km (1,670 ml) away from the nearest land.
Geographically, it is located at the intersection of the equator, the International Date Line, and the 90th meridian west.
The nearest islands to Point Nemo are unpopulated: the Pitcairn Islands’ Ducie Island to the north; Motu Nii, a small island that is part of the Easter Island chain, to the northeast, and Maher island, off the shore of Marie Byrd Land, an unclaimed territory in Antarctica, to the south.
To find the closest hint of civilization, one should travel by boat during more than two weeks to one of the world’s most isolated inhabited islands, Easter Island, which is located about 3,540 km (2,200 ml) to the west of Chile.
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👍12❤3🔥1
Ask Me
What is the most isolated location on Earth? Nowhere on Earth one can find a place further from dry land than Point Nemo. It is also known as “the oceanic pole of inaccessibility”, and is located at the point of coordinates 48°52.6′S 123°23.6′W in the South…
What do sci-fiction-pioneer Jules Verne, horror-writer H.P. Lovecraft, and the Russian space program have in common or what are some interesting facts about Point Nemo?
📍 Who Found Point Nemo?
While the oceanic point of inaccessibility has always existed, it was only just discovered in 1992, some three decades ago, thanks to modern computing and GPS technology. A Croatian-Canadian survey engineer Hrvoje Lukatela wrote a geospatial program called Hipparchus, and found Point Nemo.
📍 Point Nemo Isn’t Named After A Fish
The etymology of Point Nemo is easily confused with Disney’s well-known protagonist — fish Nemo — in the children’s show Finding Nemo. But Point Nemo was named after the famous fictional character Captain Nemo in Jules Verne’s ‘20,000 Leagues Under The Sea.’ It translates roughly to “no man” in Latin, a name that fits a place so alone in the world.
📍 Point Nemo Is A Confluence of Lifelessness
The Nemo point is an area of the deep ocean with no islands, reefs, or other land structures. Instead, the ocean floor comprises abyssal plains, trenches, and mountain ranges plagued by perpetual darkness and silence. The extreme pressure of the deep sea and cold temperatures make it uninhabitable for most life forms. Currently, only bacteria and tiny crabs have been discovered to live in the volcanic vents on the seafloor near Point Nemo.
📍 Astronauts/Cosmonauts Are The Closest People
Surprisingly, the closest people to Point Nemo are astronauts and cosmonauts on board the International Space Station (ISS) in space. At their closest, they are about 415 km (258 ml) away from the location that marks the spot.
📍 Point Nemo Is A Spacecraft Cemetery
In the 1970s, space organizations found that an extremely remote location, such as Point Nemo, is a safe “scuttling” destination for satellites and spacecraft that are deorbited for decommissioning on expiry.
It is far enough away from air and sea traffic that the spacecraft will not be disturbed, and it is located in an area of the ocean with minimal currents, so the spacecraft and its technology will not drift away.
The first spacecraft to be sent to Point Nemo was the Soviet Union’s Salyut 1 in 1971.
Since then, more than 250 spacecraft have been sent to the graveyard, including the Mir space station, the Skylab space station, and the Beagle 2 Mars lander.
When a spacecraft is sent to Point Nemo, it is deorbited before being allowed to sink to the ocean floor. This procedure is called “geological disposal,” and it ensures that the spacecraft will not pose a threat to future space missions.
The ISS will likewise be decommissioned at Point Nemo in 2028-2030.
Ultimately, Point Nemo is a unique and fascinating place, serving an important role in space exploration.
📍 Point Nemo Is The Home Of Cthulhu
Point Nemo’s location is coincidentally the home of Cthulhu, the fictional cosmic entity created by author H.P. Lovecraft in his famous fictional work — The sunken city.
Cthulhu is a massive monster that is part octopus and part dragon and wields enormous power and influence.
Point Nemo is the perfect place for Cthulhu to hide from the world.
Lovecraft puts the city in the South Pacific Ocean at 47°9′S 126°43′W, very close to Point Nemo.
The fictional submerged city was first referenced in the short story The Call of Cthulhu (1928), written 66 years before the computation and eventual mapping of Point Nemo.
📍 Point Nemo Was Once Thought To Contain Life
In 1997, scientists recorded a very loud sound originating from point Nemo, an otherwise Lifeless/deathly place. The mysterious sound traveled across the Pacific, echoing all the way.
Since then, it’s been known as the Bloop.
Scientists ran with the hypothesis that a large aquatic animal, such as a whale or a giant squid, could have caused the sound.
With Point Nemo’s proximity to H.P Lovecraft’s sunken city, conspiracy theories flew with wild abandon.
But in 2005 researchers concluded that the Bloop was simply a phenomenon caused by large icebergs calving off an ice shelf in the depth of the dark.
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📍 Who Found Point Nemo?
While the oceanic point of inaccessibility has always existed, it was only just discovered in 1992, some three decades ago, thanks to modern computing and GPS technology. A Croatian-Canadian survey engineer Hrvoje Lukatela wrote a geospatial program called Hipparchus, and found Point Nemo.
📍 Point Nemo Isn’t Named After A Fish
The etymology of Point Nemo is easily confused with Disney’s well-known protagonist — fish Nemo — in the children’s show Finding Nemo. But Point Nemo was named after the famous fictional character Captain Nemo in Jules Verne’s ‘20,000 Leagues Under The Sea.’ It translates roughly to “no man” in Latin, a name that fits a place so alone in the world.
📍 Point Nemo Is A Confluence of Lifelessness
The Nemo point is an area of the deep ocean with no islands, reefs, or other land structures. Instead, the ocean floor comprises abyssal plains, trenches, and mountain ranges plagued by perpetual darkness and silence. The extreme pressure of the deep sea and cold temperatures make it uninhabitable for most life forms. Currently, only bacteria and tiny crabs have been discovered to live in the volcanic vents on the seafloor near Point Nemo.
📍 Astronauts/Cosmonauts Are The Closest People
Surprisingly, the closest people to Point Nemo are astronauts and cosmonauts on board the International Space Station (ISS) in space. At their closest, they are about 415 km (258 ml) away from the location that marks the spot.
📍 Point Nemo Is A Spacecraft Cemetery
In the 1970s, space organizations found that an extremely remote location, such as Point Nemo, is a safe “scuttling” destination for satellites and spacecraft that are deorbited for decommissioning on expiry.
It is far enough away from air and sea traffic that the spacecraft will not be disturbed, and it is located in an area of the ocean with minimal currents, so the spacecraft and its technology will not drift away.
The first spacecraft to be sent to Point Nemo was the Soviet Union’s Salyut 1 in 1971.
Since then, more than 250 spacecraft have been sent to the graveyard, including the Mir space station, the Skylab space station, and the Beagle 2 Mars lander.
When a spacecraft is sent to Point Nemo, it is deorbited before being allowed to sink to the ocean floor. This procedure is called “geological disposal,” and it ensures that the spacecraft will not pose a threat to future space missions.
The ISS will likewise be decommissioned at Point Nemo in 2028-2030.
Ultimately, Point Nemo is a unique and fascinating place, serving an important role in space exploration.
📍 Point Nemo Is The Home Of Cthulhu
Point Nemo’s location is coincidentally the home of Cthulhu, the fictional cosmic entity created by author H.P. Lovecraft in his famous fictional work — The sunken city.
Cthulhu is a massive monster that is part octopus and part dragon and wields enormous power and influence.
Point Nemo is the perfect place for Cthulhu to hide from the world.
Lovecraft puts the city in the South Pacific Ocean at 47°9′S 126°43′W, very close to Point Nemo.
The fictional submerged city was first referenced in the short story The Call of Cthulhu (1928), written 66 years before the computation and eventual mapping of Point Nemo.
📍 Point Nemo Was Once Thought To Contain Life
In 1997, scientists recorded a very loud sound originating from point Nemo, an otherwise Lifeless/deathly place. The mysterious sound traveled across the Pacific, echoing all the way.
Since then, it’s been known as the Bloop.
Scientists ran with the hypothesis that a large aquatic animal, such as a whale or a giant squid, could have caused the sound.
With Point Nemo’s proximity to H.P Lovecraft’s sunken city, conspiracy theories flew with wild abandon.
But in 2005 researchers concluded that the Bloop was simply a phenomenon caused by large icebergs calving off an ice shelf in the depth of the dark.
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👍23❤11
Which living animals have the strongest bite?
Bite force is the force that the muscles and bones of the upper and lower jaw generate when an animal bites.
🐊🏆 The saltwater crocodile (Crocodylus porosus) has the strongest physically measured bite force at 16,414 newtons (newtons measure force magnitude) or about 1,674 kilograms/3,689 pounds of force.
The saltwater crocodile is the largest living reptile species and is found in saltwater and freshwater habitats spanning from Southeast Asia, and down to Australia’s northern coast.
Two aquatic predators could possibly beat the croc, but their bite forces have not been measured in a live setting.
The strongest bite force could be that of the orca (Orcinus orca), estimated at 84,516 newtons or about 8,618 kilograms/19,000 pounds or force, distantly followed by the bite force of a great white shark (Carcharodon carcharias)🦈, at about 18,000 newtons or 1,835 kilograms/4,045 pounds of force, according to computer models.
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Bite force is the force that the muscles and bones of the upper and lower jaw generate when an animal bites.
🐊🏆 The saltwater crocodile (Crocodylus porosus) has the strongest physically measured bite force at 16,414 newtons (newtons measure force magnitude) or about 1,674 kilograms/3,689 pounds of force.
The saltwater crocodile is the largest living reptile species and is found in saltwater and freshwater habitats spanning from Southeast Asia, and down to Australia’s northern coast.
Two aquatic predators could possibly beat the croc, but their bite forces have not been measured in a live setting.
The strongest bite force could be that of the orca (Orcinus orca), estimated at 84,516 newtons or about 8,618 kilograms/19,000 pounds or force, distantly followed by the bite force of a great white shark (Carcharodon carcharias)🦈, at about 18,000 newtons or 1,835 kilograms/4,045 pounds of force, according to computer models.
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👍21❤4🤔1
Which living creatures exert the most powerful bite force for its body size?
To determine an animal’s bite strength, some studies measure force, others measure pressure, and some take into account body mass in proportion to force. To compare bite forces in taxa of greatly differing body masses a bite force quotient (BFQ) is calculated as a regression of the quotient of an animal's bite force divided by its body mass.
The carnivorous mammal with the strongest bite for its body size is the Tasmanian devil (Sarcophilus harrisii) ⬆️. Being only about the size of a big housecat, this marsupial with jaws that can open to an 80-degree angle, can produce a bite force of 553 newtons or about 56 kg of force and a BFQ of 181 (by comparison, the tiger’s BFQ is 127).
Some animals with a huge bite aren't even predators. The Galapagos large ground finch (Geospiza magnirostris) ⬆️ weighs only about 33 grams, but its beak can crack tough nuts and seeds with a force of 70 newtons.
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To determine an animal’s bite strength, some studies measure force, others measure pressure, and some take into account body mass in proportion to force. To compare bite forces in taxa of greatly differing body masses a bite force quotient (BFQ) is calculated as a regression of the quotient of an animal's bite force divided by its body mass.
The carnivorous mammal with the strongest bite for its body size is the Tasmanian devil (Sarcophilus harrisii) ⬆️. Being only about the size of a big housecat, this marsupial with jaws that can open to an 80-degree angle, can produce a bite force of 553 newtons or about 56 kg of force and a BFQ of 181 (by comparison, the tiger’s BFQ is 127).
Some animals with a huge bite aren't even predators. The Galapagos large ground finch (Geospiza magnirostris) ⬆️ weighs only about 33 grams, but its beak can crack tough nuts and seeds with a force of 70 newtons.
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👍13❤6
How did the dinosaur with the strongest bite look like?
🦖 T.rex (Tyrannosaurus rex) that stomped the Earth from about 68 million to 66 million years ago is a repeat science fiction star for a reason: its bite was ferocious and could deliver up to six tons of pressure or about 50,000-60,000 newtons.
🦖 In museum halls, paleo art, and feature films, T. rex has traditionally been depicted with lipless jaws, banana-size fangs and a sinister grin, as seen in the top two illustrations ⬆️. But now, new evidence suggests these animals had lipped mouths, like modern-day lizards.
🦈🆚🦖 Among prehistoric animals, a possible contender of T. rex for the most powerful bite could be the huge shark Megalodon (Otodus megalodon) that terrorized the seas from 15 million to 3.6 million years ago with a bite force of up to 182,200 newtons.
ℹ️ Nevertheless, for its body size, the mighty T. rex’s bite was far less impressive than the bite of a much smaller modern dinosaur — a tiny Galapagos finch.
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🦖 T.rex (Tyrannosaurus rex) that stomped the Earth from about 68 million to 66 million years ago is a repeat science fiction star for a reason: its bite was ferocious and could deliver up to six tons of pressure or about 50,000-60,000 newtons.
🦖 In museum halls, paleo art, and feature films, T. rex has traditionally been depicted with lipless jaws, banana-size fangs and a sinister grin, as seen in the top two illustrations ⬆️. But now, new evidence suggests these animals had lipped mouths, like modern-day lizards.
🦈🆚🦖 Among prehistoric animals, a possible contender of T. rex for the most powerful bite could be the huge shark Megalodon (Otodus megalodon) that terrorized the seas from 15 million to 3.6 million years ago with a bite force of up to 182,200 newtons.
ℹ️ Nevertheless, for its body size, the mighty T. rex’s bite was far less impressive than the bite of a much smaller modern dinosaur — a tiny Galapagos finch.
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❤17👍10
Who made the first bridges?
ℹ️ The bridge is a structure that provides passage over obstacles (valleys, rough terrain, water) by spanning them with natural or human-made materials.
🔺 The ancient Assyrians and Egyptians could have been the first to introduce bridge building. Stone arches can be found over the entrance of the Great Pyramid of Giza (3200 to 4200 BC) but they were not true arches as they were made of single sloping stones meeting over an opening.
🔺 The first real evidence of bridge-building technology can be traced back to Babylonian society in about 4000BC. The river Euphrates was spanned in the center of the city of Babylon by a single brick arch, one furlong (220m) long and 10m wide ⬆️.
🔺 In China, masonry arches were also known to have existed, documented at around 2000BC. Arches can be seen in the Great Wall of China (completed 214BC) for carrying it over rivers.
🔺 The Romans incorporated the true semicircular arch into their designs in about 500-600BC.
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ℹ️ The bridge is a structure that provides passage over obstacles (valleys, rough terrain, water) by spanning them with natural or human-made materials.
🔺 The ancient Assyrians and Egyptians could have been the first to introduce bridge building. Stone arches can be found over the entrance of the Great Pyramid of Giza (3200 to 4200 BC) but they were not true arches as they were made of single sloping stones meeting over an opening.
🔺 The first real evidence of bridge-building technology can be traced back to Babylonian society in about 4000BC. The river Euphrates was spanned in the center of the city of Babylon by a single brick arch, one furlong (220m) long and 10m wide ⬆️.
🔺 In China, masonry arches were also known to have existed, documented at around 2000BC. Arches can be seen in the Great Wall of China (completed 214BC) for carrying it over rivers.
🔺 The Romans incorporated the true semicircular arch into their designs in about 500-600BC.
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👍15❤10👌2
What is the oldest existing bridge?
The Arkadiko Bridge, also called the Kazarma Bridge, in modern Greece 🇬🇷 is believed to be the oldest existing bridge in the world.
⬆️ It is an arch bridge and one of the oldest of this type still used by the local population.
In Mycenaean (last phase of the Greek Bronze Age from 1600 – 1100 BCE) times, this bridge, built around 1300 – 1190 BCE, served as a highway in the area.
ℹ️ Besides the Arkadiko Bridge, among 🔟oldest bridges in the world,
🇹🇷4️⃣ are located in modern Turkey
Karamagara Bridge (built c.5th or 6th century CE)
Bridge near Limyra (built possibly c.3rd century CE)
Cendere Bridge (built c.200 CE)
Bridge Over River Meles/Caravan Bridge (built c.850 BCE)
🇮🇹2️⃣ in modern Italy
Ponte Sant’Angelo (built 134 CE)
Pons Fabricius (built 62 BCE)
🇮🇷1️⃣ in modern Iran – Band-e Kaisar (built c.260-270 CE)
🇪🇸1️⃣ in modern Spain – Alcántara Bridge (built 104-106 CE)
🏴1️⃣ in modern England – Tarr Steps (built possibly c.1000 BCE).
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The Arkadiko Bridge, also called the Kazarma Bridge, in modern Greece 🇬🇷 is believed to be the oldest existing bridge in the world.
⬆️ It is an arch bridge and one of the oldest of this type still used by the local population.
In Mycenaean (last phase of the Greek Bronze Age from 1600 – 1100 BCE) times, this bridge, built around 1300 – 1190 BCE, served as a highway in the area.
ℹ️ Besides the Arkadiko Bridge, among 🔟oldest bridges in the world,
🇹🇷4️⃣ are located in modern Turkey
Karamagara Bridge (built c.5th or 6th century CE)
Bridge near Limyra (built possibly c.3rd century CE)
Cendere Bridge (built c.200 CE)
Bridge Over River Meles/Caravan Bridge (built c.850 BCE)
🇮🇹2️⃣ in modern Italy
Ponte Sant’Angelo (built 134 CE)
Pons Fabricius (built 62 BCE)
🇮🇷1️⃣ in modern Iran – Band-e Kaisar (built c.260-270 CE)
🇪🇸1️⃣ in modern Spain – Alcántara Bridge (built 104-106 CE)
🏴1️⃣ in modern England – Tarr Steps (built possibly c.1000 BCE).
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❤14👍8🔥1
Which country has the longest bridge?
🥇🇨🇳 China has the longest bridge in the world – the Danyang-Kunshan Grand Bridge ⬆️.
it has a length 164km (104 miles) and is part of the Beijing–Shanghai High-Speed Railway.
It was built at a cost of around $8.5bn ( $52m for each km of the bridge) and can withstand not only seismic activity, but also extreme weather, and even a hit from a 300,000-ton naval vessel.
Today, China can be called a country of longest bridges, as, among 🔟 longest bridges in the world, 6️⃣ are located in continental China.
Besides the Danyang-Kunshan Grand Bridge, China has
Cangde Grand Bridge (1️⃣1️⃣6️⃣ km, #️⃣3️⃣ in the world)
Tianjin Grand Bridge (1️⃣1️⃣3️⃣ km, #️⃣4️⃣in the world)
Weinan Weihe Grand Bridge (7️⃣9️⃣ km, #️⃣5️⃣in the world)
Beijing Grand Bridge (4️⃣8️⃣ km, #️⃣7️⃣in the world)
Wuhan Metro Bridge (3️⃣7️⃣ km, #️⃣9️⃣in the world)
ℹ️ At last count in 2021, China has a whopping 961,100 road bridges, and that's not including other types of transport.
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🥇🇨🇳 China has the longest bridge in the world – the Danyang-Kunshan Grand Bridge ⬆️.
it has a length 164km (104 miles) and is part of the Beijing–Shanghai High-Speed Railway.
It was built at a cost of around $8.5bn ( $52m for each km of the bridge) and can withstand not only seismic activity, but also extreme weather, and even a hit from a 300,000-ton naval vessel.
Today, China can be called a country of longest bridges, as, among 🔟 longest bridges in the world, 6️⃣ are located in continental China.
Besides the Danyang-Kunshan Grand Bridge, China has
Cangde Grand Bridge (1️⃣1️⃣6️⃣ km, #️⃣3️⃣ in the world)
Tianjin Grand Bridge (1️⃣1️⃣3️⃣ km, #️⃣4️⃣in the world)
Weinan Weihe Grand Bridge (7️⃣9️⃣ km, #️⃣5️⃣in the world)
Beijing Grand Bridge (4️⃣8️⃣ km, #️⃣7️⃣in the world)
Wuhan Metro Bridge (3️⃣7️⃣ km, #️⃣9️⃣in the world)
ℹ️ At last count in 2021, China has a whopping 961,100 road bridges, and that's not including other types of transport.
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❤15👍12🔥5👏3😱2
Why are many children fussy eaters?
A new study demonstrates that at the age of six, children become extra fussy, particularly about the texture of their meal. The researchers asked 485 children between the ages of 5 and 12 to choose between six different foods with and without lumps, seeds and pieces of fruit in them ⬆️. In 76% of the instances, 6-year-olds opted for foods without lumps, the highest preference rate observed across the age groups.
According to researchers, food neophobia – a fear and rejection of eating new or unfamiliar foods – may be the main explanation for such children's eating behavior. Food neophobia is thought to be a protective function against dangerous foods, which seems to be particularly important for 6-7 aged children when they start to become more mobile and independent.
However, the study showed that the "anti-chunk phase" gradually goes the other way in 7–12-year-olds, even if parents often need to offer new foods up to 15 times.
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A new study demonstrates that at the age of six, children become extra fussy, particularly about the texture of their meal. The researchers asked 485 children between the ages of 5 and 12 to choose between six different foods with and without lumps, seeds and pieces of fruit in them ⬆️. In 76% of the instances, 6-year-olds opted for foods without lumps, the highest preference rate observed across the age groups.
According to researchers, food neophobia – a fear and rejection of eating new or unfamiliar foods – may be the main explanation for such children's eating behavior. Food neophobia is thought to be a protective function against dangerous foods, which seems to be particularly important for 6-7 aged children when they start to become more mobile and independent.
However, the study showed that the "anti-chunk phase" gradually goes the other way in 7–12-year-olds, even if parents often need to offer new foods up to 15 times.
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❤9👍9👎1
What supercontinents have existed throughout Earth’s history?
📌 The continents we live on today are moving, and over hundreds of millions of years they get pulled apart and smashed together again. Occasionally, this tectonic plate-fueled process brings most of the world's landmasses together to form a massive supercontinent.
📌 There's no strict definition for a supercontinent, but researchers say it should include around 75% of the available landmass.
Supercontinents are also defined as single connected continents made up of all or most of the land on the surface of Earth.
📌 Recently, thanks to research into the mineral distribution and carbon dating, scientists can piece together what past supercontinents might have looked like, how they formed and how they broke apart.
📌 Scientists believe that new supercontinents are forming and splitting up about every 400 to 500 million years.
📌 Although all models of early Earth’s plate tectonics are very theoretical, researchers can generally agree that there have been a total of seven or eight supercontinents ⬇️ and are relatively sure of at least three (Columbia, Rodinia and Pangaea).
🟤 The first and earliest supercontinent to have existed is Vaalbara that is suspected to have formed 3.6 billion years ago.
🟤 The supercontinent Ur formed approximately 3 billion years ago.
🟤 The supercontinent Kenorland came together between about 2.72 and 2.45 billion years ago.
🟤 The supercontinent Columbia, also called Nuna or Hudsonland, formed about 1.7 billion years ago and broke up approximately 1.5 billion years ago.
🟤 The supercontinent Rodinia existed from around 1 billion years ago to 700 million years ago.
🟤 The supercontinent Gondwana formed around 530 million years ago and was the largest landmass on Earth for more than 200 million years.
🟤 The supercontinent Pannotia may have briefly existed around 560 million years ago.
🟤 The most recent supercontinent, Pangaea, formed around 320 million years ago and broke up around 175 million years ago.
📌 The first supercontinents may have formed from the same cratons – stable blocks of Earth’s crust that form the center of a continent. These cratons can now be found in different parts of modern continents.
📌 Since subduction and seafloor melt replace plate tectonic material, nearly all of the land that makes up the Earth’s crust is less than 200 million years old, so it is still difficult to find evidence of the supercontinents before Pangaea.
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📌 The continents we live on today are moving, and over hundreds of millions of years they get pulled apart and smashed together again. Occasionally, this tectonic plate-fueled process brings most of the world's landmasses together to form a massive supercontinent.
📌 There's no strict definition for a supercontinent, but researchers say it should include around 75% of the available landmass.
Supercontinents are also defined as single connected continents made up of all or most of the land on the surface of Earth.
📌 Recently, thanks to research into the mineral distribution and carbon dating, scientists can piece together what past supercontinents might have looked like, how they formed and how they broke apart.
📌 Scientists believe that new supercontinents are forming and splitting up about every 400 to 500 million years.
📌 Although all models of early Earth’s plate tectonics are very theoretical, researchers can generally agree that there have been a total of seven or eight supercontinents ⬇️ and are relatively sure of at least three (Columbia, Rodinia and Pangaea).
🟤 The first and earliest supercontinent to have existed is Vaalbara that is suspected to have formed 3.6 billion years ago.
🟤 The supercontinent Ur formed approximately 3 billion years ago.
🟤 The supercontinent Kenorland came together between about 2.72 and 2.45 billion years ago.
🟤 The supercontinent Columbia, also called Nuna or Hudsonland, formed about 1.7 billion years ago and broke up approximately 1.5 billion years ago.
🟤 The supercontinent Rodinia existed from around 1 billion years ago to 700 million years ago.
🟤 The supercontinent Gondwana formed around 530 million years ago and was the largest landmass on Earth for more than 200 million years.
🟤 The supercontinent Pannotia may have briefly existed around 560 million years ago.
🟤 The most recent supercontinent, Pangaea, formed around 320 million years ago and broke up around 175 million years ago.
📌 The first supercontinents may have formed from the same cratons – stable blocks of Earth’s crust that form the center of a continent. These cratons can now be found in different parts of modern continents.
📌 Since subduction and seafloor melt replace plate tectonic material, nearly all of the land that makes up the Earth’s crust is less than 200 million years old, so it is still difficult to find evidence of the supercontinents before Pangaea.
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How many continents in the world?
In fact, the answer to this question is unequivocal, and there are 5️⃣ popular models.
7 continents: Africa, Antarctica, Asia, Australia/Oceania, Europe, North America, South America. Most popularly accepted model, commonly…
In fact, the answer to this question is unequivocal, and there are 5️⃣ popular models.
7 continents: Africa, Antarctica, Asia, Australia/Oceania, Europe, North America, South America. Most popularly accepted model, commonly…
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Why was the first supercontinent named Vaalbara?
The earliest and the most theoretical, the supercontinent Vaalbara is postulated to have existed about 3,5 billion years ago, in the early Archean Eon.
The name "Vaalbara" comes from the last four letters in the names of two cratons: the Kaapvaal craton in Southern Africa ⬆️ and the Pilbara craton in Western Australia ⬆️. Paleomagnetic data indicate that about 3.8 billion years ago they were very close to each other.
Containing some of the oldest rock on the surface of the planet, the Kaapvaal and Pilbara cratons also show evidence of four large meteorite impacts between 3.2 and 3.5 billion years ago.
There are three lesser-known cratons in East Antarctica that were probably included in the land mass of Vaalbara.
Geological evidence from the time of Vaalbara indicates that intracrustal melting and recycling must have been a major part of the early days of continent building. The planet must have been hot.
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The earliest and the most theoretical, the supercontinent Vaalbara is postulated to have existed about 3,5 billion years ago, in the early Archean Eon.
The name "Vaalbara" comes from the last four letters in the names of two cratons: the Kaapvaal craton in Southern Africa ⬆️ and the Pilbara craton in Western Australia ⬆️. Paleomagnetic data indicate that about 3.8 billion years ago they were very close to each other.
Containing some of the oldest rock on the surface of the planet, the Kaapvaal and Pilbara cratons also show evidence of four large meteorite impacts between 3.2 and 3.5 billion years ago.
There are three lesser-known cratons in East Antarctica that were probably included in the land mass of Vaalbara.
Geological evidence from the time of Vaalbara indicates that intracrustal melting and recycling must have been a major part of the early days of continent building. The planet must have been hot.
Subscribe- t.me/askmenow
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