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Air Pressure A measure of the force of the air pressing down on earth. Atmosphere The air that surrounds the earth made up of different layers. Barometer Instrument used to measure air pressure Cirrus Clouds Feathery clouds made of ice crystals that are usually associated with fair weather. climate The average of all weather conditions of an area over a long period of time. condense When water vapor turns back into liquid. cumulonimbus Tall, dense clouds associated with thunderstorms. Cumulus clouds Fluffy, white clouds that look like cotton balls and are usually associated with fair weather. evaporation The process in which liquid water turns into gas or water vapor. fog Forms when condensed water floats in the air near the ground. front Formed when two air masses with different properties meet. humidity The amount of moisture in the air. hurricane A powerful storm originating in the ocean that brings heavy rains and severe winds. precipitation The process by which water returns to the Earth, in the form of rain, snow, etc. Rain gauge A straight sided container with a flat bottom used to measure rainfall. runoff Water from rain or snow that flows on the ground and eventually into streams. Stratus clouds Thick, layered gray clouds that form blankets in the sky and are associated with rain or snow. temperature Heat that can be measured in degrees Fahrenheit or Celcius. thunder Occurs when there is a violent expansion of air that has been heated by lightening. tornado A destructive funnel shaped windstorm. troposphere Layer of Earth’s atmosphere where weather takes place. Weather vane An instrument used to measure the direction of the wind.