Water Cycle Notes.

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 Water on Earth is naturally recycled through the water cycle.  The sun is the source of energy that drives the water cycle.
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Presentation transcript:

Water Cycle Notes

Water continually cycles between the atmosphere (troposphere), land, and ocean via the water cycle. The following processes are propelled by sunlight and gravity:

Precipitation • After condensation occurs (forming clouds), water droplets fall in various forms of precipitation – rain, snow, freezing rain, sleet, or hail, depending upon weather conditions. • Temperature variations within clouds and/or within the region between the cloud and Earth allows for the various forms of precipitation. • Gravity is the driving force for precipitation.

Evaporation/Transpiration • Water enters the atmosphere as water vapor through the processes of evaporation and transpiration (i.e. plants releasing water vapor). • Thermal energy from the sun causes water to evaporate and/or transpire.

Condensation/Crystallization As water vapor rises in the atmosphere it can turn into water droplets or ice crystals which results in cloud formation. Condensation of water vapor into water droplets or ice crystals must occur on a surface. In the atmosphere, dust particles (or any other particulates) serve as a surface for water to condense on. These processes can form on Earth’s surface in the following forms: Dew forms when water vapor condenses directly onto a surface; Frost forms when water vapor changes from gas directly to ice crystals on a surface when the temperature at which condensing would take place are at the freezing point or below.

Downhill Flow of Water on Land If precipitation falls on land surfaces, it always attempts to move back toward sea level as surface-water flow or groundwater flow. The surface that receives the precipitation determines its flow back towards sea level. Examples are: Water will remain on the surface when the surface is not porous or the precipitation is falling too fast for the water to sink into the ground. Water will sink into the ground when the surface is porous and there is space in the soil to hold the water. Gravity is the driving force for downhill flow of water on land

Extended Knowledge The amount of water on Earth has not changed over Earth’s history. Therefore, pollution can effect this cycle and the organisms that rely on it. There are human and natural factors that affect the quality of the water in the water cycle.