Water Cycle
Published on Nov 18, 2015
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PRESENTATION OUTLINE
-Step 1: Evaporation
The water cycle starts with evaporation. It is a process where water at the surface turns into water vapors. Water absorbs heat energy from the sun and turns into vapors.
Photo by The^Bob
-Step 2: Condensation
As water vaporizes into water vapor, it rises up in the atmosphere. At high altitudes the water vapor changes into very tiny particles of ice/water droplets because the temperature at high altitudes is low.
Photo by zoer
Step 3- Sublimation
Sublimation is a process where ice directly converts into water vapors without converting into liquid water.
Photo by Roberto Verzo
-Step 4: Precipitation
The clouds (condense water vapors) then pour down as precipitation due to wind or temperature change. This occurs because the water droplets combine to make bigger droplets.
Photo by Amir Kuckovic
-Step 5: Transpiration
As water precipitates, some of it absorbs by the soil. The water enters into the process similar to evaporation where liquid water is turned into vapor by the plants.
Photo by mmechtley
-Step 6: Runoff
As the water pours down, it leads to runoff. Run off is the process where water runs over the surface earth. When snow melts into water it also leads to runoff. As water runs over the ground it displaces the top soil with it and moves the minerals among the stream. The runoff combines to form channels and then rivers and ends up into lakes, seas and oceans. Here the water enters hydrosphere.
Photo by Ed Suominen
Step 7: Infiltration
Some of the water that precipitates does not runoff into the rivers and is absorbed by the plants or gets evaporated. It moves deep into the soil. This is infiltration. The water seeps down and increases the level of ground water table. It is called pure water and is drinkable. The infiltration is measured as inches of water-soaked by the soil per hour.
Photo by Speckled Jim
-Water pollution from water cycle
Runoff is water from rain or melted snow which is not absorbed and held by the soil, but runs over the ground and through loose soil. Agricultural runoff is water leaving farm fields because of rain, melted snow, or irrigation. As runoff moves, it picks up and carries pollution, which it can deposit into ponds, lakes, coastal waters, and underground sources of drinking water.
Photo by UC Davis Arboretum & Public Garden
