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What is the upper mantel?

Updated: 4/28/2022
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14y ago

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The upper mantel is the part of the mantel nearest to the Earth's surface. It is a little cooler than the lower mantel therefore more viscous, or pasty, than the lower mantel. Temperatures range between 932 °F-1,652 °F. at the upper boundary with the crust to over 7,200 °F at the boundary with the core. Although the higher temperatures far exceed the melting points of the mantle rocks at the surface (about 1200 °C for representative periditute), the mantle is almost exclusively solid. The enormous lithostatic pressure exerted on the mantle prevents "melting," because the temperature at which melting begins (the solidus) increases with pressure.

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14y ago
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Q: What is the upper mantel?
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