Crust

The Earth's crust is the outermost layer of the Earth. It is a thin, solid shell that covers the Earth's surface.

Composition

The crust is primarily composed of solid rocks and minerals. It is made up of two types of crust: continental crust and oceanic crust.

Continental Crust

Continental crust is thicker and less dense compared to oceanic crust. It mainly consists of granite and other light-colored rocks.

Oceanic Crust

Oceanic crust is thinner and denser compared to continental crust. It is primarily composed of basalt and other dark-colored rocks.

Thickness

The thickness of the Earth's crust varies. Continental crust is generally thicker, ranging from 20 to 70 kilometers, while oceanic crust is thinner, averaging about 7 kilometers in thickness.

Functions

The crust plays a crucial role in supporting life on Earth. It provides a solid surface for the existence of landforms, such as mountains, plains, and valleys. Additionally, the crust prevents the escape of the Earth's atmosphere and provides a habitat for various organisms.

Study Guide

• What are the two types of crust?
• Describe the composition of continental crust.
• Explain the thickness variation between continental and oceanic crust.
• What role does the Earth's crust play in supporting life?

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