There are some deserts that are located along coastlines,
where intuition would seem to indicate that moisture should
be plentiful. However, the driest place on Earth is the Atacama
Desert, located along the coast of Peru and Chile. The
Namib Desert of southern Africa is another coastal desert,
which is known legendarily as the Skeleton Coast, because it
is so dry that many of the large animals that roam out of the
more humid interior climate zones perish there, leaving their
bones sticking out of the blowing sands.
How do these coastal deserts form adjacent to such large
bodies of water? The answer lies in the ocean currents, for in
these places cold water is upwelling from the deep ocean,
which cools the atmosphere. The effect is similar to rainshadow
deserts, where cold air can hold less moisture, and the
result is a lack of rain.














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