With the help of a neat diagram explain the constitution of lithosphere and asthenosphere. Also discuss their role in plate tectonics.

The Earth is made up of several layers, with the lithosphere and asthenosphere playing crucial roles in plate tectonics. Understanding these layers helps to explain various geological phenomena, including the movement of tectonic plates, earthquakes, and volcanic activity.

Lithosphere:
The lithosphere is the Earth's outermost layer, consisting of the crust and the uppermost portion of the mantle. It is rigid and brittle, and it is broken into tectonic plates that float on the more fluid asthenosphere beneath. The lithosphere is approximately 100 km thick but can vary ____ ____ ______ _____ _______ __________ _______ _______.
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