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Geography 7 Online
OpenStudy (anonymous):

what is the thickness of the upper mantel

OpenStudy (anonymous):

Two main zones are distinguished in the upper mantle: the inner asthenosphere composed of plastic flowing rock about 200 km (120 mi) thick, and the lowermost part of the lithosphere composed of rigid rock about 50 to 120 km (31 to 75 mi) thick.

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