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LiveScience
LiveScience
Stephanie Pappas

RARE PHOTOS: Study reveals flawed argument in debate over when plate tectonics began - The Real Truth

A view of Earth from space.

Earth's crust today has a surprisingly similar composition to the planet's first outer shell, or "protocrust," new research finds.

This early rocky shell featured chemical signatures previously thought to occur only in continental crusts made by the process of subduction, in which one tectonic plate slides under another.

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