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There is also the theory of continental drift, or when the Earth was once one big continent, called Pangaea. The continents drifted on their tectonic plates to their current location. You can still see how the continents fit together like puzzle pieces!
Archaeologists study fossils of animals that have died and whose bones were buried under layers of Earth. Some of the same animals were found on opposite sides of the Earth, which supports the idea of Pangaea.
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