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Moisture in the atmosphere SWBAT explain how clouds are formed; identify the basic characteristics of different cloud groups; describe the water cycle. Cloud Formation How do clouds form? When warm moist air rises, expands, and cools in a convection current, it reaches its dew point and the water vapor collects around a condensation nuclei. When millions of these droplets collect a cloud forms. When wind encounters a mountain and has nowhere to go but up, the effect is the same with the air rising and cooling. When air masses of differing temperatures collide, warm air rises and cools and condenses into a cloud Cloud Formation Condensation nuclei Small particles in the atmosphere around which cloud droplets can form Orographic lifting When air hits a mountain and rises to form a cloud Stability The ability of an air mass to resist rising Latent heat The stored energy from the transfer of water into a gaseous state Types of Clouds Cirrus Wispy stringy clouds Cumulus Puffy, lumpy looking clouds Stratus Sheets Nimbus Low, gray rain clouds Types of Clouds Cirrus High clouds Bases start above 6000 m Alto Middle clouds Bases between 2000 m to 6000 m Strato Low clouds Bases below 2000 m Precipitation Coalescence When cloud droplets collide and join together to form a larger droplet Precipitation All forms of water that fall from the clouds Water cycle The constant movement of water between the atmosphere and Earth’s surface Evaporation When liquid turns to gas The Water Cycle Describe the water cycle. Water from Earth’s surface heats up and evaporates, turning into gas and rising into the atmosphere. When it cools it condenses, or collects, around a condensation nuclei, creating a cloud. The droplets then coalesce and gravity pulls them back to earth as precipitation. Precipitation is either soaked into the ground and becomes groundwater or runs off into a body of water where the process begins again. In 2’s or 3’s Answer questions 1-5 on page 291. Be sure to answer in complete sentences. If you don’t finish in class you must finish it for homework. Get your lab notebooks In your lab groups complete the mini lab on page 290. Send one person to gather your supplies Read through ALL of the instruction before you begin While waiting to observe, create a water cycle poster in your groups