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The layer which is believed to be the source of volcanic activity is ________

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The layer which is believed to be the source of volcanic activity is ________

(a) Inner core

(b) Outer core

(c) Asthenosphere

(d) Mohorovicic layer

This question was addressed to me in homework.

This interesting question is from The Mantle, The Core in chapter Internal Structure of the Earth of Engineering Geology

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Right option is (c) Asthenosphere

To explain I would say: The asthenosphere is believed to be the source of much volcanic activity and many other processes. It is said be to located completely in the upper mantle.

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