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Chapter 13 Vocab

Chapter 13 Scinec

QuestionAnswer
water cycle the continual movement of water among Earths atmosphere, oceans and land surface through evaporation, condensation, and preicpitation.
evaporation the process by which water molecules in liquid water escape into the air as water vapor.
humidity the amount of water vapor in a given volume of air.
realtive humidity the percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a paticular temperature.
psychrometer an instrument used to measure relative humidity, consisiting of a wet bulb thermometer and a dry bulb thermeoter.
condensation the process by which molecules of water vapor in the air become liquid water.
dew point the temperature at which condensation begins
cirrus wispy, feathery clouds made mostly of ice crystals that form at high levels.
cumulus fluffy, white clouds, usually with flat bottoms, that look like rounded piles of cotton.
stratus clouds that form in flat layers and often cover much of the sky.
precipitation any form of water that falls from the clouds and reaches earths surface
air mass a huge body of air that has similair temperature, humidity, and air pressure throughout.
tropical air mass a warm air mass that forms in the tropics and has low air pressure.
polar air mass a cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and has high pressure.
maritime air mass a humid air mass that forms over oceans
continental air mass a dry air mass that forms over land
front the boundary where unlike air masses meet but do not mix
occluded cut off, as ina front where warm air mass is cought between 2 cooler air masses
cyclone a swirling center of low air pressure
anti-cyclone a high pressure center of dry air
storm a violent disturbance in the atmosphere
thunderstorm a small storm often accompained by heavy precipiation and frequent lightning.
lightning a sudden spark, or energy, dishcharge, caused when electrcity jump between parts of a cloud,between nearby clouds, or between a cloud and the ground.
tornado a rapidly, whirling funnel-shpaped cloud that reaches down froma stprm cloud to touch earths surface.
hurricane a tropical storm that has winds of about 119 kilometers per hour or higher
storm surge a "dome" of water that sweeps across the coast where a hurrican lands.
meteroloigist a scientsit who studies the causes of weather and tries to predict it.
isobar a line on a weather map that joins places that have the same air pressure.
isotherm a line on a weather map that joins places that have the same temperature.
Created by: 071407
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