Jumat, 11 Mei 2012
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novi_blog
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21.29
How does Rain Happen?
Rain is the primary source of fresh water for most areas of the world,
providing suitable conditions for diverse ecosystems, as well as water for
hydroelectric power plants and crop irrigation.
The phenomenon of rain is actually a water circle. The concept of the water
cycle involves the sun heating the Earth's surface water and causing the
surface water to evaporate. The water vapor rises into the Earth's atmosphere.
The water in the atmosphere cools and condenses into liquid droplets. The
droplets grow until they are heavy and fall to the earth as precipitation which
can be in the form of rain or snow.
However, not all rain reaches the surface. Some evaporates while falling
through dry air. This is called virga, a phenomenon which is often seen in hot,
dry desert regions.
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