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15 terms


Earth Science
convection cells
Circular patterns caused by the rising and sinking of air. It is this motion which causes global wind patterns.
Coriolis effect
The way Earth's rotation makes winds in the Northern Hemisphere curve to the right and winds in the Southern Hemisphere curve to the left.
trade winds
Steady global winds that blow northeast from 30 degrees north latitude to the equator and that blow southeast from 30 degrees south latitude to the equator
prevailing westerlies
Steady global winds that blow west to east between 30 and 60 degrees in the northern and southern hemispheres.
polar easterlies
Steady global winds that blow from east to west between 60 degrees and 90 degrees latitude in both hemispheres.
A frequently windless area near the Equator (0 degrees latitude).
horse latitudes
A belt of calm or light winds located near 30 degrees latitude in both hemispheres.
Distance in degrees north or south of the equator
An imaginary circle around the middle of the earth, halfway between the North Pole and the South Pole (0 degrees latitude).
jet streams
Band of high-speed, high-altitude westerly winds. They form at boundaries between cold and warm air masses.
sea breezes
Local wind which is formed during the day, the wind blows from the sea towards land. (Land heats faster than water.)
valley breezes
Local wind which is formed during the day, blowing from cooler valleys to warmer mountains. (Mountains heat faster than the valleys.)
mountain breezes
Local winds that form at night, when cooler mountain air moves in to replace warmer air in the valley.
Why do sea breezes occur?
Sea breezes occur because the land heats faster than the water, causing the warm air to rise. The cool air of the water replaces the warmer air.
Why do mountain breezes occur?
Mountain breezes occur because the mountain heats up first. As the warm air rises, the cooler air of the valley rushes up the mountain.