The Asthenosphere is part of which layer of the Earth?

mantle

Explanation:

Asthenosphere, zone of Earth's mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. The asthenosphere extends from about 100 km (60 miles) to about 700 km (450 miles) below Earth's surface.

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condenser is used to focus in the light microscope.