Lithosphere

The rigid, rocky outer layer of the Earth, consisting of the crust and the solid outermost layer of the upper mantle. It extends to a depth of about 60 miles (100 km). It is broken into about a dozen separate, rigid blocks, or plates. Slow convection currents deep within the mantle, generated by radioactive heating of the interior, are believed to cause the lateral movements of the plates (and the continents that rest on top of them) at a rate of several inches per year.

Sources

Britannica, T. Editors of Encyclopaedia (2020, April 17). lithosphere. Encyclopedia Britannica. https://www.britannica.com/science/lithosphere

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