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_________ is thought to be the main rock of the earth's upper mantle, and the source of most basaltic magma
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_________ is thought to be the main rock of the earth's upper mantle, and the source of most basaltic magma

User John Von Neumann
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Answer is Peridotite.

Reason is - Scientists know that the mantle is made of peridotite rock based on evidence from seismic waves, heat flow, and meteorites.
User Hoque
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