The document summarizes the layers of Earth's atmosphere. It begins with the troposphere, the lowest layer where weather occurs and life exists. Above is the stratosphere where temperature increases with altitude due to ozone absorption. Next is the mesosphere where temperatures decrease with altitude to as low as -143°C. The thermosphere follows, with temperatures reaching 2000°C from solar radiation. The outermost layer is the exosphere, where molecules can escape into space. The greenhouse effect is also mentioned, where gases trap heat radiating from the surface.

1. The Atmosphere

2. The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth’s gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention ( greenhouse effect ), and reducing temperature extremes between day and night.

3. Air is the name given to atmosphere used in breathing and photosynthesis. Composition of air

4. ● ______ ● ______ ● ______ ● ______ The Atmosphere The temperature in the atmosphere varies depending on the different layer we are in.

5. Exosphere Thermosphere Troposphere Stratosphere Mesosphere

13. Since part of this re-radiation is back towards the surface, energy is transferred to the surface and the lower atmosphere. As a result, the temperature there is higher than it would be if direct heating by solar radiation were the only warming mechanism. The greenhouse effect is a process by which radiation from the surface of the Earth is absorbed by atmospheric gases, and is re-radiated in all directions.

14. Exosphere Thermosphere Mesosphere Stratosphere Troposphere Earth