Exosphere

The exosphere is the outermost layer of Earth's atmosphere. It begins at the exobase, which is located at the top of the thermosphere, and extends into outer space. This region is where the Earth's atmosphere merges with space, and it is composed of very low-density gases, such as hydrogen and helium, along with some heavier molecules like oxygen and nitrogen.

Key Points to Remember:

• The exosphere is the outermost layer of Earth's atmosphere.
• It begins at the exobase, located at the top of the thermosphere, and extends into outer space.
• The exosphere is composed of very low-density gases, such as hydrogen and helium, along with some heavier molecules like oxygen and nitrogen.

Study Guide Questions:

1. Where does the exosphere begin?
2. What are the main gases found in the exosphere?
3. What is the exobase?