Earth's Atmosphere

The Earth's atmosphere is a layer of gases that surrounds the planet and is held in place by Earth's gravitational pull. It plays a crucial role in supporting life and regulating the planet's temperature.

Composition of the Atmosphere

The Earth's atmosphere is primarily composed of nitrogen (78%) and oxygen (21%), with trace amounts of other gases such as argon, carbon dioxide, and water vapor.

Layers of the Atmosphere

The atmosphere is divided into several layers based on temperature changes with increasing altitude. These layers include the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

Functions of the Atmosphere

The atmosphere serves several important functions, including:

• 1. Protection from the sun's harmful ultraviolet (UV) radiation
• 2. Regulation of the Earth's temperature through the greenhouse effect
• 3. Facilitation of weather patterns and phenomena
• 4. Support of life through the provision of oxygen and carbon dioxide exchange

Study Guide

Here are some key points to focus on while studying Earth's atmosphere:

1. What are the main gases that make up Earth's atmosphere?
2. Explain the role of the ozone layer in the atmosphere.
3. Describe the temperature changes with increasing altitude in each layer of the atmosphere.
4. Discuss the greenhouse effect and its impact on the Earth's climate.
5. Explain how the atmosphere supports life on Earth.

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