The document provides information about the Earth's atmosphere for an upcoming test. It defines the atmosphere as the blanket of gases surrounding Earth. It then discusses the layers of the atmosphere - troposphere, stratosphere, mesosphere, thermosphere, and exosphere - and briefly describes each layer and what occurs within it. Some key statistics about how the sun's energy interacts with the atmosphere and Earth's surface are also presented. Finally, it lists some of the main greenhouse gases in our atmosphere.