Which layer is Earth's outermost solid layer?

Which layer is Earth's outermost solid layer?

• A. Crust
• B. Mantle
• C. Outer Core
• D. Inner Core

Answer: (A)

The outermost solid layer of Earth is the crust. It forms the surface you walk on and sits atop the mantle, with the boundary between them known as the Moho. The crust comes in two types: continental crust, which is thick and less dense, and oceanic crust, which is thinner and more dense. Beneath the crust lies the mantle, which is solid rock that can flow very slowly over long periods. Deeper still are the core layers: a liquid outer core and a solid inner core. Since the question specifies the outermost solid layer, the crust is the correct choice.

The outermost solid layer of Earth is the crust. It forms the surface you walk on and sits atop the mantle, with the boundary between them known as the Moho. The crust comes in two types: continental crust, which is thick and less dense, and oceanic crust, which is thinner and more dense. Beneath the crust lies the mantle, which is solid rock that can flow very slowly over long periods. Deeper still are the core layers: a liquid outer core and a solid inner core. Since the question specifies the outermost solid layer, the crust is the correct choice.