Earth’s interior

Definition

Earth's interior consists of multiple layers, including the crust, mantle, and core. These layers vary in composition, temperature, and physical state, influencing geological activity on the planet's surface.

5 Must Know Facts For Your Next Test

1. The Earth's interior is divided into three main layers: the crust, mantle, and core.
2. The mantle makes up about 84% of Earth's volume and is composed mostly of silicate minerals.
3. The outer core is liquid and primarily composed of iron and nickel, creating Earth's magnetic field.
4. The inner core is solid despite its high temperature due to immense pressure.
5. Seismic waves generated by earthquakes are used to study the different layers of Earth's interior.

Review Questions

• What are the three main layers of Earth's interior?
• How does the composition of the outer core differ from that of the mantle?
• Why is the inner core solid despite extremely high temperatures?

Related terms

Crust: Earth's outermost layer, composed mainly of rock.

Mantle: A thick layer of silicate rock between the crust and core.

Core: The innermost part of Earth consisting of a liquid outer core and a solid inner core primarily made up of iron and nickel.