The present surface of the Earth consists of seven continents, five of which are separated by the major oceans. However, about 200 million years ago, all the continents on the Earth were actually one huge “supercontinent” surrounded by one enormous ocean, the Tethys Sea. This gigantic continent, called Pangaea was formed approximately 300 million years ago, and then began to break apart after about 100 million years and spread out to form the continents we know today.
The name is derived from Ancient Greek pan (πᾶν, “all, entire, whole”) and Gaia (Γαῖα, “Mother Earth, land”).
Study the map below. It’s a map of Pangea mapped with contemporary geopolitical borders. What you see here is an anachronistic mashup — a modern map with its various parts relocated to the general position they would have occupied before Pangea began drifting apart some 100-million years ago.
Scientists have found many kinds of evidence that support this idea. The distribution of fossils across the continents is one line of evidence pointing to the existence of Pangaea.
Watch a ‘supervideo’ from Khan Academy:
Two other types of evidence are:
– Identical rocks have been found on different continents. These rocks formed millions of years ago, before the continents separated. They formed from the same minerals and under the same conditions.
– The shapes of continents fit together like a puzzle. Just look at the east coast of South America and the west coast of Africa—it’s almost a perfect fit!