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45 Cards in this Set
- Front
- Back
air pollution
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the presence of harmful substances in the air
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air pressure
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the weight of air pushing down on something
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altitude
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the height above sea level; also called elevation
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anemometer
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a weather instrument that measures wind speed
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air
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a mixture of gases that surround the earth
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air mass
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a large bubble of air that has about the same temperature and humidity throughout
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atmosphere
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the air that surrounds the earth
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blizzard
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a snowstorm with high winds and low temperatures
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barometer
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a weather instrument that measures air pressure
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climate
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the general weather of an area over a long period of time
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cloud
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a mass of water droplets or ice crystals that have clumped together in the atmosphere
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cirrus clouds
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high, feathery clouds made up of ice crystals
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cold front
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the leading edge of a moving mass of cooler air
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cumulonimbus clouds
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huge vertical clouds that can produce a thunderstorm
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cumulus clouds
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puffy white clouds with a flat bottom
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el nino
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a temporary change in the climate caused by temperature shifts in the pacific ocean
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flash flood
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a sudden rush of water that overflows a stream after a heavy rain
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fog
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a layered cloud that forms close to the ground
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front
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a place where one air mass meets and pushes aside another air mass
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greenhouse effect
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the process of earth's atmosphere trapping heat near the surface
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high pressure
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an area where the air pressure is higher than it is in surrounding areas
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humidity
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water vapor in the air
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hurricane
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a very large and violent tropical storm
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hydrosphere
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all the liquid water and ice on the earth's surface, liquid water in the ground, and water vapor in the atmosphere
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hygrometer
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a weather instrument that measures relative humidity
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low pressure
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an area where the air pressure is lower than it is in surrounding areas
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mesosphere
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the middle layer of the earth's atmosphere
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nimbostratus clouds
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low gray clouds that produce rain or snow
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polar climate
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a cold dry climate located in bands around the north and south poles
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precipitation
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water that falls to the ground in the form of rain, snow, sleet, or hail
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relative humidity
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the amount of water vapor that the air is holding compared with the amount of water it could hold
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stratosphere
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the second lowest layer of air in the earth's atmosphere
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stratus clouds
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flat gray clouds that cover the sky
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temperate climate
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a climate with temperatures that change with the seasons and precipitation that varies from place to place and season to season
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thermosphere
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the second highest layer of the earth's atmosphere
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thunderstorm
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a storm with lightning, thunder, rain, and sometimes hail
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tornado
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a dark funnel of strong winds that spiral upward from the ground
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tropical climate
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a warm climate located in a wide band around the equator
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troposphere
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the first layer of the earth's atmosphere; weather takes place here
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warm front
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a the leading edge of a moving mass of warmer air
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weather
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the condition of the atmosphere at a certain place for a short period of time
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weather forecaster
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a person who predicts what the weather may be based on weather data
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weather system
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an area in the lower atmosphere where the air is moving around a high pressure area or a low pressure area
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wind
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moving air
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wind vane
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a weather instrument that shows the direction the wind is coming from
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