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35 Cards in this Set

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  • Back
the layer of gases surrounding earth- provides earth with gases to support life absorbs and distributes warmths- stores releases heat
composition of atmosphere
keep earth from moving into space-mixture of gases liguid water exerts pressure in all directions
most abundent gases?
and there precents?
nitrogen- 78%
Oxygen- 21%
solids- dust pollen tiny liguids, droplets like acid in atmorsphere
layers of the atmosphere
1-tropshere 2-stratoshere 3-mesosphere 4-thermosphere exospere
troposphere is?
layer closest to teh earhts surface contains 3/4 of matter in earths whole atmospere
stratpsphere is?
obsorbs most of the suns ultraviolet eadiation. coantins little ozone
mesosphere is?
contains little ozone
thermpsphere is?
filters out harmfull x-rays and gamma rays from the sun
exosphere is?
extends ouward to where space begins and contains few atoms. no clear boundary sperates it from space
ionosphere is?
can reflect amradio waves makes long communitcation possible
water cycle is?
evaporation-water energy heat liquid to h2o vapor - tranpsiration water from plants go into the sky condensation -water goes back to droplets to earth
what does weather mean?
describes teh current condition of atmosphere.
temperature is?
sun-soarce almost of aengergy. when sun rays hit earht energy is obsorbed. temp measures how how fast air milecules are moving.ll
energy tranfer?
fast mving molecules trnaferm energy to slower moving molecules when tgey bump into each other
humitity is?
air warms up cause water to contact with evaporation to form vapor. amount of water vapor in atmosphere.
relative humidity
measure of amount of water vapor that is present compared to amount that could be held a a specific temp.
clouds are what?
form when air rises, cools to its dew point then becomes saturated
low clouds are what?
include puffy clouds form when air rises carrys moist 2000 or less altitude
middle clouds are what?
2000 -8000 m layerd variety sometimes alot of moist which make light precipitation
high/vertical clouds are?
happenin air so cold they are made of ice crystals
precipitation is?
when drops of water or crystals of ice become too large to be suspended in a cloud they fall as it. inrain freezing rain, sleet, snow and hail.
wind is?
molecules in atmosphere are heated, they move more rapidly and spread apart. wind-less dense moves upward slower-move closer
gernarl air circulation
sun ays strike earthnear equator then near the poles.
surface winds
air in equartor is heated by suns ray
westerlies & easterlies
blow from wes & are called previeling westerlies tehy form boundarys frmo col dair to the poles and milder air closer to equator
Jet stream
within zone. like giant rivers of air low near the top of troposphere from west to to east
other winds
forming around the world bc of heated & cooling differences
air mass is?
large body of air that developes over a particular region of earths surface
where air masses of different temps meet a boundary between them
cold fronts?
what forms?
cold air mass advances and pushes under a warm air mass warm air mass is forced to rise cloud snad precipitaion develope.crop in temp
warm fronts
when warm air advances into a region of colder air, warm air front is formed. less dence air slides up over colder denser air mass
stationary fronts
warm air and cold air mass meet but neither advances
occluded front
illistrates how and occluded front foms fast movingcolr front overtakes a lsower warm front
high and low pressure?
high pressure= air sinks
air flows into low pressure center it rises adn cools