Earth's tectonic plates, illustration. There are seven primary tectonic plates that make up the Earth's crust. This view, with lines of latitude and l

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Earth's tectonic plates, illustration. There are seven primary tectonic plates that make up the Earth's crust. This view, with lines of latitude and longitude, shows parts of the North American, Eurasian, African, and South American plates. Phenomena observed at the boundaries (red) between these plates include earthquakes, volcanic activity, mountain-building, and oceanic trench formation. The movement of the tectonic plates over millions of years of geologic time drives the creation, destruction and drifting of the continents. The movement of the tectonic plates is driven by convection currents in the underlying mantle.

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Photo credit: © PETER MATULAVICH/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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