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Earth is missing a huge part of its crust. Now we may know why.

Earth is missing a huge part of its crust. Now we may know why.

National Geographic - Robin George Andrews

A fifth of Earth’s geologic history might have vanished because planet-wide glaciers buried the evidence. The Grand Canyon is a gigantic geological library, with rocky layers that tell much of the story of Earth’s history. Curiously though, a sizeable layer representing anywhere from 250 million …

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