The rigid portion of Earth's mantle below the asthenosphere.

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Multiple Choice

The rigid portion of Earth's mantle below the asthenosphere.

Explanation:
The mantle is separated by how easily rocks deform: the upper part includes a weak, ductile layer called the asthenosphere that sits beneath the lithosphere, allowing plate movement. Below this, the rocks become much more rigid due to higher pressures, forming the lower mantle. This rigid region extends from about the 660 km depth down to the boundary with the outer core, making it the solid, stiff portion of the mantle beneath the asthenosphere.

The mantle is separated by how easily rocks deform: the upper part includes a weak, ductile layer called the asthenosphere that sits beneath the lithosphere, allowing plate movement. Below this, the rocks become much more rigid due to higher pressures, forming the lower mantle. This rigid region extends from about the 660 km depth down to the boundary with the outer core, making it the solid, stiff portion of the mantle beneath the asthenosphere.

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