The layer that sits between the crust and the outer core?

The layer that sits between the crust and the outer core?

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

Answer: (B)

The question is about the order of Earth's internal layers. The layer directly beneath the crust is the mantle. It stretches from the base of the crust, at the Moho boundary, down to the point where the outer core begins, about 2,900 kilometers (roughly 1,800 miles) below the surface. The mantle is mostly solid rock, but it behaves plastically over long timescales, which allows convection currents that drive plate tectonics. The upper part includes the asthenosphere, which helps move tectonic plates, while the lower mantle is more rigid. Understanding the other layers helps see why the mantle fits here: the outer core lies below the mantle and is liquid iron-nickel, the inner core sits at the very center as a solid sphere, and the crust is the outermost shell.

The question is about the order of Earth's internal layers. The layer directly beneath the crust is the mantle. It stretches from the base of the crust, at the Moho boundary, down to the point where the outer core begins, about 2,900 kilometers (roughly 1,800 miles) below the surface. The mantle is mostly solid rock, but it behaves plastically over long timescales, which allows convection currents that drive plate tectonics. The upper part includes the asthenosphere, which helps move tectonic plates, while the lower mantle is more rigid.

Understanding the other layers helps see why the mantle fits here: the outer core lies below the mantle and is liquid iron-nickel, the inner core sits at the very center as a solid sphere, and the crust is the outermost shell.