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Earth Crust - About Planet Earth
Earth Crust
The crust, the uppermost layer of the solid Earth, is a region of interaction between surface pro­cesses brought about by the heat of radioactive reactions deep in the Earth.
The crust is divided into ocean crust and con­tinental crust. The average height of the two dif­fers by about 4.5km and the difference in their average total thickness is more exaggerated.
Cratons are large masses of Precam­brian rock that have been unaffected by later mountain-building.
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