Question

explain layer of crust class 8​

Answer 1

Answer:

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Answer 2

Answer:

THE LAYERS OF THE CRUST

The outermost layer of the Earth, the Crust, can be divided by its physical properties into the Lithosphere and Asthenosphere.

The Lithosphere (stone sphere) is the rigid outer-most layer of the Earth. The Lithosphere is the relatively cool, rigid shell of the Earth that consists of the Crust and the upper 80 to 100 km of the Mantle (which adheres to the crust.) The Lithosphere is approximately 200 km thick (under continental crust) and breaks up into tectonic plates. The Lithosphere is the "plate" of the Plate Tectonic theory. The base of the Lithospheres is marked by a "low-velocity" seismic zone where seismic waves slow down as they enter the warm, plastic Asthenosphere.

The Asthenosphere (weak sphere) is part of the Mantle that flows, a characteristic called plastic behavior. It might seem strange that a solid material can flow. A good example of a solid that flows is the movement of toothpaste in a tube. The flow of the Asthenosphere is part of mantle convection, which plays an important role in moving Lithospheric plates. The Asthenosphere is the relatively warm, plastic (possibly partially molten) portion of the upper Mantle that extends from as shallow as 10 km depth (at Mid-Ocean Ridges) to approximately 700 km.