The asthenosphere is the outer layer of Earth, which is rigid and is broken into individual plates.

Name: The asthenosphere is the outer layer of Earth, which is rigid and is broken into individual plates.
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The asthenosphere is actually a semi-solid layer below the Earth's crust, and it is the layer upon which the Earth's tectonic plates "float" and move. The rigid outer layer of Earth is known as the lithosphere.

The Asthenosphere Is the Outer Layer of Earth, Which Is