How the Earth Once Swallowed Its Ocean
Date: 2020-01-23 17:00:11
Our planet is about 4.5 billion years old and it has a history of doing shadowy things, such as creating landmasses and then making them disappear. Around 1 billion years ago, a mysterious supercontinent was formed, and it swallowed and flipped the mainland inside out. And that could happen again quite soon in geological time.
The historical period when the land connected to become the Rodinia supercontinent and the time frame it split are a big foggy. Geologists believe that roughly every 600 million years we are met with the same fate. Our continents connect to form a huge landmass; our oceans connect to form a super-ocean; and then they split.
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The first supercontinents 0:53
Rodinia begins to split 1:39
The ozone layer is formed 2:56
The Earth’s litoshpere 3:40
The alternating cycles of the Earth 4:20
Subduction zones 5:07
Introversion and extroversion shifting methods 6:11
The ocean disappears 7:31
The next supercontinent 8:22
#earthhistory #supercontinent #brightside
-The first supercontinent ever was Nuna. Then, after some more million years, Rodinia. It collected most of the Earth’s landmasses and then split around 750 million years ago.
-The breakup was triggered by a superplume – huge rising jets of hot molten rock in the Earth’s mantle began expanding. That caused enormous volcanic eruptions that were later found in every continent.
-The ozone shield started forming a little after the Rodinia continent appeared. Since its appearance, it began absorbing higher levels of radiation from the sun, and that allowed life on land to flourish.
-According to one of the papers, the Earth has two alternating cycles. The first one runs for 600 million years and it brings all the landmasses together. The second cycle lasts for double the time – around 1.2 billion years — and a new super ocean is born.
-Subduction zones are the boundaries that mark the collision between tectonic plates. When tectonic plates meet at a subduction zone, one bends and then slides under the other.
-During the introversion method, the oceanic crust dives back into the Earth’s hot mantle. But extroversion is quite different. That method creates a new super ocean and a fresh landmass.
-Both Nuna and Rodinia had the same super-ocean surrounding them. When the Oceanic crust started to subduct, Rodinia began separating and the sea disappeared. Interestingly, that super ocean re-appeared as the Panthalassa in the formation of Pangea.
-The future hypothetical supercontinent is given the name of Amasia. Right now, the tectonic plates are moving North, which includes Australia and Africa. It is estimated that in a few hundred million years all the landmasses excluding Antarctica will connect in the North Pole to form the Amasia.
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