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‘Waterworld’ Earth preceded late rise of continents, scientist proposes

Expansion of dry land may have enabled Cambrian explosion

ocean

WATER WORLD  The continents rose above sea level only a few hundred million years ago, a new proposal states. Before that time, Earth’s surface was mostly covered by water.

Tfioreze/Wikimedia Commons (CC BY-SA 3.0)

By Thomas Sumner

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