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Upper mantle
Layer of the Earth's interior extending from the base of the crust to 670 kilometres 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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- Part of Speech: noun
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- Category: Physical geography
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