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Weather

Unit 8 Weather

QuestionAnswer
atmosphere The gases that surround the earth.
air pressure A measure of the amount of pressure being exerted on a location by the atmosphere.
humidity A measure of the amount of water vapor in the air.
air mass A large body of air with relatively uniform characteristics.
weather front The boundary between two air masses.
prevailing winds The directional winds that usually occur in a region.
psychrometer Instrument that measures humidity.
barometer Instrument that measures air pressure.
anemometer Instrument that measures wind speed.
conduction The transfer of energy by direct contact.
convection The transfer of energy by the circular movement of a liquid or gas.
radiation The transfer of energy by electromagnetic waves.
jet stream A narrow band of winds greater than 57 miles per hour in the upper atmosphere.
gulf stream A warm ocean current that flows from the Gulf of Mexico across the Atlantic to the coast of Europe.
gyre A large system of rotating ocean currents.
hurricane A large rotating storm with very low air pressure that begins over warm ocean waters.
electromagnetic spectrum The spectrum of waves from gamma rays to radio waves that can travel without a medium. All of them travel at the speed of light.
density The amount of matter in a given space or volume. Mass divided by volume.
global warming The gradual increase in teh average temperature of the earth.
greenhouse effect The warming of the earth caused by gases in the atmosphere trapping heat.
Low pressure Air pressure associated with rising air, cloudy skies and rainy conditions.
High pressure Air pressure associated with falling air, fair skies, and dry conditions.
greenhouse gas Gases like methane and carbon dioxide in the atmosphere that trap heat in the earth.
Created by: dmiles
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