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Click & LearnDownload the accompanying student worksheet under "Downloads." What did Earth look like 250 million years ago? Or 1 billion years ago? Or 4.5 billion years ago? EarthViewer is an interactive tool that allows you to explore the science of Earth's deep history.
Clips(2 min 14 sec) African rift valleys were formed by the separation of tectonic plates. Water flows down to the valley floors, creating rivers and lakes.
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