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No, although a large part of the mantle forms the mesosphere, the upper brittle mantle is part of the lithosphere and the ductile layer of the mantle below this is formed of the asthenosphere. The mantle below the asthenosphere (i.e. that part from 700 km down to the core-mantle boundary is the mesosphere).

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11y ago
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Q: Is the mesosphere the same as the mantle?
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