core. sediment. lithosphere. hemisphere.
I gave my students this multiple choice question: A layer of solid brittle rock comprises the outer 100 kilometers of Earth. This layer, which contains both the crust and the upper mantle, is called the

Only one answer is correct among these 4 choices:
- core.
- sediment.
- lithosphere.
- hemisphere.

Could you tell me which one is correct?

lithosphere.