Topical Terminology > Upper Mantle
Upper Mantle
For Upper Mantle we have a term and definition in Physical Geography.
Upper Mantle (Physical Geography) 
Layer of the Earth's interior extending from the base of the crust to 670 kilometers below the surface. Part of the Earth's mantle layer. The upper mantle is composed of peridotite, an ultramafic magma primarily made up of the minerals olivine and pyroxene. The top layer of the upper mantle, 100-350 km below surface, is called the asthenosphere.
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