2 1. Describe the conditions that are necessary for clouds to form. You need particulates (dust, pollen, etc.) with water vapor and a temperature below the dew point so that the air is saturated and clouds can form.
4 2. Explain the four processes of cooling that can lead to cloud formation. Adiabatic cooling: rising and expansion of an air massMixing: mixing of moist air with another air mass of different temperatureLifting: forced upward movement of air as it moves up a mountainAdvective cooling: an air mass moving over a cooler surface (land or water)
7 3. Compare cirrus, cumulus, and stratus clouds. Cirrus: wispy, high-altitude clouds composed of ice crystalsCumulus: puffy, vertically growing clouds, usually associated with fair weatherStratus: layered and form when warm moist air lies above a layer of cooler air
8 4. Compare clouds with fog. Both form as a result of condensation of water vapor in the airFog occurs near the surface of EarthClouds occur at higher altitudes
10 5. Describe four ways in which fog can form. Radiation fog occurs as a result of the nightly cooling when a layer of air is in contact with the cold groundAdvection fog occurs when warm, moist air moves across a cold surface, like when moist ocean air flows over land