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Weather Chapter 2
Term | Definition |
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water cycle | the continuous movement of water from water sources, such as lakes and oceans, in to the air, onto and over land, into the ground, and back to the water sources. |
weather | the condition of the atmosphere at a particular time and place. |
humidity | the amount of water vapor or moisture in the air. |
relative humidity | the amount of moisture the air contains compared to the maximum amount given as a percentage |
condensation | process by which a gas, such as water vapor, becomes a liquid. It occurs when saturated air cools further |
dew point | the temperature to which air must cool to completely be saturated. |
cloud | is a collection of milliions of tiny water droplets or ice crystals |
precipitation | water, in solid or liuied form, that falls from the air to the Earth |
air mass | a large body of air that has similar temperature ad moisture throughout |
maritime | forms over water |
continental | forms over land |
polar | forms over the polar regions; cold |
tropical | forms over the Tropics; warm |
front | the boundary that forms when two different air masses meet |
cold front | cold air mass meets and displaces a warm air mass; produces thunderstorms, heavy rain, or snow; cooler weather usually follows |
warm front | warm air mass meets and overrides a cold air mas; generally bring drizzly precipitation; after it passes, weather conditions are clear and warm |
occluded front | faster moving cold air mass from two directions that forces warm air up; cool temperatures and large amounts of precipitation |
stationary front | cold air mass meets a warm air mass with little to no horizontal movement; weather is similar to that produced by a warm front. |