2/19/2012 08:08:00 PM
alasnews
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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