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 in thickness depending on location. It includes both the continental crust, which is thicker and less dense, and the oceanic crust, which is thinner and denser.

The lithosphere is responsible for the formation of Earth's surface features, such as mountains, valleys, and ocean basins. ______ _______ ________ ________ _____ ____ _____ __________ _______ _______ __________.
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