Final answer:
The lithosphere is rigid and brittle, and the asthenosphere is ductile and responsible for plate motion in the Earth's crust.
Explanation:
Lithosphere is the outermost layer of the Earth, consisting of the crust and upper mantle, characterized by being rigid and brittle.
The asthenosphere lies below the lithosphere, is ductile, and can flow due to convection currents generated by heat, playing a crucial role in plate motion as the overriding lithosphere is pushed by its movement.
The interaction between the lithosphere and asthenosphere is essential in plate tectonics, where the lithospheric plates float and move independently on the asthenosphere.
Learn more about Layers of the Earth here:
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