Earliest Evidence of Plate Tectonics
The earliest evidence of the tectonic plates was found in Greenland which was estimated to be abbout 3.8 billion years old. Covnersely, researchers have found that the tectonic plates have been active for as long as 4 billion years ago.
There have been two supercontinents: The Rodinia which happened a billion years ago while the most recent one The Pangea formed about 300 million years ago.
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There are seven major plates that currently exist:
Although, evidence has been found that the Indo-Australian plate has cracked therefore making the total existing plates to 8.
Since National Geographic began making maps in 1915, it has recognized four oceans: the Atlantic, Pacific, Indian, and Arctic Oceans. Starting on the World Oceans Day 2021 (June 8) it has also recognized the Southern Ocean as the world’s fifth ocean.
It has long been recognized by scientists, but the lack of an international agreement kept the editors from formally adding it to the list.
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