| A | B |
|---|
| thermometer | used to measure temperature |
| barometer | used to measure air pressure |
| as elevation increases | temperature decreases |
| climate | general temperature and precipitation conditions for a large area |
| troposphere | layer of atmosphere nearest to Earth's surface |
| exosphere | outermost layer of the atmosphere that merges into outer space |
| ultraviolet radiation | too much exposure can cause skin cancer |
| precipitation | when moisture condenses out of air and falls to the ground |
| methane, nitrous oxide and carbon dioxide | contribute to the greenhouse effect |
| relative humidity | amount of water vapor in the air compared to the greatest amount that could possibly be held in the air |
| saturated | when air holds all the water vapor that it possible can |
| low pressure systems | indicate precipitation and storms |
| high pressure systems | indicate good, clear weather |
| dew point | the temperature at which water vapor in the air condenses |
| meteorologist | forecasts the weather |
| osobars | lines connecting points of equal pressure on weather maps |
| sleet | frozen rain |
| snow | solid water that sublimates directly from water vapor |
| sublimation | when gas changes to solid |
| as air is warmed its density | decreases |
| humidity | measurement of water vapor |
| aneroid barometer | uses a needle to indicate air pressure |
| clouds form when | moisture in the air condenses on dust particles |
