How do we know what’s in the earth’s center?

We can make estimates regarding the composition of Earth’s interior regions is by recording and calculating how dense our planet is.

Crust: A very thin, solid outer layer. The oceanic crust is about 5 km (3 miles) thick. The continental crust is from 30–40 km (18–24 miles) thick.

Mantle: The layer beneath the crust. The mantle is about 2885 km (1790 miles) thick.

Upper mantle: Includes a solid layer fused to the crust. This layer combined with the crust is called the lithosphere. Beneath this is the asthenosphere, which is a partly molten layer. The asthenosphere is thought to be the layer upon which tectonic plates ride. The upper mantle is about 700 km (420 miles) thick.

Lower mantle: Is composed of solid rock under conditions of extremely high temperature and pressure. This layer is about 2,185 km (1,370 miles) thick.

Outer Core: A layer about 2,270 km (1,400 miles) thick, having the properties of a metallic liquid.

Inner Core: A solid, metallic, spherical layer about 1,216 km (755 miles) thick.


Picture Credit : Google