| Term | Definition |
|---|---|
| climate | The normal pattern of weather in an area over many years |
| El Nino | Event that occurs when warm ocean currents in the Pacific Ocean change their direction |
| ocean currents | Moving streams of water in the ocean |
| air mass | A body of air that has about the same temperature and moisture throughout |
| atmosphere | a mixture of gases that surrounds the planet |
| front | the boundary between two air masses that have different properties |
| meosphere | the third layer of Earth's atmosphere |
| stratosphere | the second layer of Earth's atmosphere |
| thermosphere | the fourth layer of Earth's atmosphere |
| troposphere | the layer of the atmosphere closest to Earth |
