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21 Cards in this Set
- Front
- Back
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Weather
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The condition of the atmosphere at a particular time and place
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Water cycle
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The continuous movement of water from water sources
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Humidity
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The amount of water vapor or moisture in the air
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Relative humidity
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the amount of moisture the air contains compared with the maximum amount it can hold at a particular temperature
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Condensation
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The process by which a gas such as water vapor becomes a liquid
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Dew point
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The temperature to which air must cool to be completely saturated
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Cloud
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A collection of millions of tiny water droplets or ice crystals
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Precipitation
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Water, in solid or liquid form, that falls from the air to the earth
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air mass
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A large body of air that has similar temperature and moisture throughout
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Front
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The boundary between two different air masses
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Thunderstorms
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Small, intense weather systems that produce strong winds, heavy rain, lightning, and thunder.
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lightning
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A large electrical discharge that occurs between two oppositely charged surfaces
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Tornadoes
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tall, rotating columns of air that touch the ground
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Hurricane
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Large, rotating tropical weather system with wind speeds of at least 119 kilometers per hour
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Thunder
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The sound that results from the rapid expansion of air along the lightning strike
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Thermometer
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A tool used to measure air temperature
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Barometer
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The instrument used to measure air pressure
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Windsock
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A cone shaped piece of material that indicates weather direction
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Wind vane
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An arrow shaped tool used to measure wind direction
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Anemometer
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A tool with three or four cups connected to a pole used to measure wind speed
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Isobars
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lines that connect points of equal air pressure rather than equal elevation
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