Glacial sediments greased the gears of plate tectonics

June 9, 2019 - General

Earth’s outer layer is composed of giant plates that grind together, sliding past or dipping beneath one another, giving rise to earthquakes and volcanoes. These plates also separate at undersea mountain ridges, where molten rock spreads from the centers of ocean basins.

This view of the Grand Canyon shows the Great Unconformity, a boundary where nearly a billion years’ worth of
sedimentary deposits is missing from the geologic…

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Source: archeo

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