Water Cycle

Evaporation, condensation.precipitation, and transpiration

Evaporation.......... Water is transferred from the surface to the atmosphere through evaporation, the process by which water changes from a liquid to a gas. About 80% of all evaporation is from the oceans, with 20% remaining, coming from inland water and vegetation, winds transport the water.Condensation is the change of water from its gaseous form into liquid water............ condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets. The upward motions that generate clouds can be produced by convection in unstable air, lifting of air by fronts and lifting over elevated such as mountains.................. Precipitation...when cloud particles become too heavy to remain suspended in the air. they fall to the earth as precipitation. Precipitation occurs in a variety of forms; hail, rain, freezing rain, sleet or snow. This portion of the Clouds and Precipitation module focuses on precipitation and has been organized.............Transpiration is the evaporation of water into the atmosphere from the leaves and stems of plants. Plants absorb soilwater through their roots and this water can originate from deep in the soil. This pumping is driven by the evaporation of water through small pores called stomates, which are found on the undersides of leaves. transpiration accounts for about 10% of all evaporating water.o







Stratus, cumulus, cirrus clouds, and fog

Stratus.....Stratus clouds are uniformed layered clouds that are below 6,000 feet. They are formed in sheets and are usually associated with overcast weather. Fog or mist is the result of very low stratus clouds. They are shallow but cover a large area, and they can bring precipitation. When heavier rain falls from them, their title is changed to nimbostratus clouds. Stratus clouds are formed when a weak upward air current lifts a thin layer of air high enough to start condensation of the excess water vapor if the air temperature falls below the dew point.......cumulus......are puffy clouds that sometimes look like pieces of floating cotton. The top of the cloud has rounded towers. When the top of the cumulus resembles the head of a cauliflower, it is called cumulus congestus or towering cumulus. These clouds grow upward, and they can develop into a giant cumulonimbus, which is a thunderstorm......cirrus....are thin, wispy clouds blown by high winds into long streamers. Cirrus clouds usually move across the sky from west to east. They generally mean fair to pleasant weather.....fog....is considered a low cloud that is either close to ground level or in contact with it. As such, it is made up of water droplets that are in the air like a cloud. Unlike a cloud however, the water vapor in fog comes from sources close to the fog like a large water body or a moist ground.