What about clouds? What are clouds? Large masses of millions of water droplets suspended in air Water evaporates from lakes, streams, and oceans and enters into the air Transpiration ? the loss of water from plants through their leaves Evapotranspiration ? combines evaporation and transpiration Example of Transpiration: Cloud Forest Steps involved in cloud formation: ?..Warm, MOIST air RISES ?.a drop in air pressure causes?.. ?.Expansion and the air Cools .... Water vapor then?.. ??..Condenses on?? ?..Condensation Nuclei (a surface upon which condensation droplets can stick on. Ex: dirt, salt, smoke) ??..Clouds form!!! Condensation Nuclei Size comparison between raindrop and condensation nuclei Cirrus clouds ? High altitude clouds Cumulus Clouds