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The asthenosphere consists of many varieties of rock which is mostly in a semi molten condition. The temperatures in the asthenosphere reach levels high enough for most of the rock to become soft and plastic, capable of slowly moving while remaining in a solid state, while only about 10 percent is totally molten. The soft, plastic, but solid quality of the asthenosphere allows lithospheric plates to slide on top, resulting in the many earthquakes which occur in this region.

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13y ago

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