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elements that make up the atmosphere 78% nitrogen, 21%oxygen layer of atmosphere that we live in troposphere 5 conditions of weather temp ,rain, humidity, wind pressure tools we measure the conditions of weather with thermometer, hydrometer. anomometer, rain,gauge, barometer water cycle condensation, evaporation,precipitation,surface run off,ground water how high/low pressure move air moves from high pressure to low pressure causes of high pressure cold air causes of low pressure warm air cold front a cold air mass moves in and overtakes a warm mass. It brings cold temps, clouds and rain quickly. Can cause strong gusts of wind and violent storms. warm front warm air mass moves over a retreating cold air mass. It brings warm temps, high clouds and some light rain. stationary front the boundary between two unmoving air masses. reason for colder at higher elevation temperatures decrease at higher elevation. Air molecules decrease at higher elevations and the sun heats air molecules. tornado violently spinning funnel cloud over land that generates big winds hurricane huge wind mass that forms over warm ocean water. Wind speed=74-200mph. Calm central core called "eye" surrounded by a think wall of clouds. Gets slower over land.