| A | B |
|---|
| weather | the conditions of the atmosphere at a certain place and time |
| atmosphere | the layers of air that surround Earth's surface |
| climate | the average weather conditions in an area over a long period of time |
| air pressure | the weight of air as it presses down on Earth's surface |
| greenhouse effect | the process by which heat from the sun builds up near Earth's surface and is trapped there by the atmosphere |
| troposphere | this layer of the atmosphere begins at the ground and rises to 10 km. The temperature decreases as the height increases |
| mesophere | layer of atmosphere from 50 km to 80 km above the earth; coldest |
| stratosphere | 10 km to 50 km above the earth; the sun's powerful rays heat it up |
| thermosphere | 80 km to 700 km. Space begins at the top of this layer |
