Atmosphere

The atmosphere is a layer of gases that surround the Earth. It is held in place by the force of gravity and is essential for sustaining life on our planet. The atmosphere is composed of several different layers, each with its own unique characteristics.

Composition of the Atmosphere

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

Layers of the Atmosphere

The atmosphere is divided into five main layers: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has distinct properties and plays a crucial role in regulating the Earth's climate and protecting us from harmful radiation.

Functions of the Atmosphere

The atmosphere serves several important functions, including:

• Regulating the Earth's temperature through the greenhouse effect
• Protecting the Earth from harmful solar radiation
• Supporting life by providing the air we breathe
• Playing a role in the water cycle and weather patterns

Study Guide

Here are some key points to remember about the atmosphere:

1. What are the primary gases that make up the Earth's atmosphere?
2. What are the five main layers of the atmosphere, and what are their characteristics?
3. What are the functions of the atmosphere, and why is it important for sustaining life on Earth?
4. How does the atmosphere regulate the Earth's temperature?
5. What is the role of the atmosphere in the water cycle and weather patterns?

[Atmosphere] Related Worksheets and Study Guides:

• Earth's freshwater and atmosphereScience • Fifth Grade
• Earth's AtmosphereScience • Sixth Grade