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

The Earth's lithosphere and asthenosphere are critical components of the planet's structure and play a significant role in plate tectonics, which is the theory that explains the movement of Earth's lithospheric plates. Let's explore their constitution and their role in plate tectonics with the help of diagrams.

1. Lithosphere: The lithosphere is the rigid outermost layer of the Earth. It consists of two main components:

A. Crust: The Earth's crust is the thin, solid outermost layer and is divided into two types:

• Continental Crust: This is the thicker and less dense crust that makes up the continents. It primarily consists of granitic rocks.
• Oceanic Crust: This is the thinner and denser crust found beneath the ocean basins. It is primarily composed of basaltic rocks.
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