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Fronts Air Mass – this is a huge “bubble” of air that shares the same temperature and pressure. (can be big enough to cover a couple states!) Warm Air Mass – this is an air mass made up of warm air that has a low pressure. Usually holds a lot of moisture. Forms over hot land or water. L Cold Air Mass – this is an air mass made up of cool temperatures and high pressure. Usually does not hold much moisture Forms over cold water or land. H Front – this is the edge of an air mass that is near another air mass. Warm Front Cold Front Stationary Front (doesn’t move much) Occluded Front (Mixture of 2 fronts) Cloud Types Cumulus – large fluffy white clouds white with gray centers appear on nice summer days. Cumulonimbus – these are storm clouds formed form cumulus clouds form higher in the sky than cumulous bring storms with rain and hail. Stratus –these clouds spread across the sky in flat, gray layers. form low in the sky hold a lot of moisture. Cirrus – these are wispy white clouds with feathery edges. made of tiny ice crystals highest clouds in the sky seen when weather is cool and dry. Water Cycle The water cycle is the process that makes it possible for water to travel all over the world. Evaporation – water changes from a liquid into a gas. warm air absorbs water (example- puddles drying on a sunny day.) Condensation – water changes form a gas into a liquid. warm air cools and releases the water. (example- water forming on the outside of a cold glass.) Precipitation – water falls from the sky as a solid or a liquid rain, sleet, snow, hail Collection – water collects on the ground in puddles and lakes.