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infared radiation

heat waves of lengths longer than those wave lengths of visible light

greenhouse effect

proces by which water vapor and carbon dioxide in the atmosphere obsorb and reflect infared rays


water vapor in the air

relative humidity

a comparison between an amount of moisture in air at a certin temperaturend amount the air could hold at that temperature


a fierce tropical storm with winds 74 mph or faster

low latitudes

an area close to the equator ranging from 30 N latitude to 30 S latitude


a fierce storm or hurricane which forms a pacific ocean or a china sea


a fierce storm or wind system that rotates as it travels


a section of the ocean near the equator having no winds

trade winds

prevailing winds in the low laitudes blowing almost continually toward the equator

prevailing westerlies

winds blowing from the west in the middle latitudes

high latitudes

region from 60 N latitudes to the north pole and from 60 S latitude to the south pole

polar easterlies

prevailing from the east near the north or south poles

jet stream

a long narrow belt of high speed winds traveling from west to east


one of 4 different times of year when a certain amount of the suns energy reaches the earth

tropic of cancer

a line of latitude 23 1/2 N of the equator and furthest north that overhead sun reaches

summer solstice

the day with the longest period of daylight in the northern hemisphere and horter period in the southern hemisphere

arctic circle

an imaginary line circling earth at 66 1/2 N of the equator

antarctic circle

an imaginary line circling earth at 66 1/2 S of the equator

fall equinox

a time of days and nightsre equal length in both hemispheres begining of the fall in the northern hemisphereand spring in the southern hemisphere

tropic of capricorn

line of latitude 23 1/2 S of the equator and farthest south that overhead sun reaches

winter solstice

a day with the shortest period of daylight in the northern hemisphere and longest in the southern hemisphere

spring equinox

a time when days and nights are equal length in both hemispheres, begining of spring in the northern hemisphere and fall in the southern hemisphere

sea breeze

cool air blowing inland from sea during the day

land breeze

cool air blowing out to sea at night

orographic effect

precipitation cused by air moving up and over mountains


side which faces wind


a side that faces away from wind

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