Ascension Composite Cadet Competition Practice Test

Which layer lies between the crust and the outer core?

Inner Core Outer Core Mantle Crust

Correct Answer:

Mantle

Explanation:

Earth's structure is arranged in layers: crust, mantle, outer core, and inner core. The layer lying directly beneath the crust and above the outer core is the mantle. The mantle spans from the boundary with the crust down to the boundary with the outer core and is bulk-rock with both upper and lower portions. The upper part includes the asthenosphere, where rocks are capable of flowing slowly, which helps drive plate tectonics. The inner core sits at the very center, and the outer core lies beneath the mantle. So the mantle is the layer between the crust and the outer core.

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