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 Deserts
are areas with less than 25cm of rain per year, with little or no vegetation.
The
overall temperature of deserts varies depending on where they are found
in the world.
Temperature
can range from 50 degrees Celsius with intense light and heat by day,
to zero degrees or below at night.
The
sky is often cloudless by day giving low humidity of 15% becoming high
to saturated at night.
Soils
are mainly coarse minerals with little or no organic content (humus) and
poor water retention. Some deserts have underground water accessible to
very deep tree roots.
Deserts
cover 1/5th of the world's land surface and - surprisingly - produce 1/5th
of the world's food
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