Within the upper mantle, from 350 to about 100 km below the surface, is a region called the __________ where the balance between temperature and pressure is such that rocks have little strength.

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The Answer of Within the upper mantle, from 350 to about 100 km below the surface, is a region called the __________ where the balance between temperature and pressure is such that rocks have little strength.

Within the Upper Mantle, from 350 to About 100 Km