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B
Asthenosphere
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C
Mesosphere
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D
Barysphere
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Solution
The correct option is B Asthenosphere Explanation:
Asthenosphere:
The asthenosphere is the layer of earth located in the upper portion of the mantle, beneath the lithosphere.
It is considered to be extending up to 400 km. It is the main source of magma that finds its way to the surface during volcanic eruptions.
The characteristics of the asthenosphere are that it is composed of semi-fused and solid materials. The asthenosphere is responsible for the renewal and expansion of the ocean floor.