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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