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Most of the information we have about our world contains a location reference,
placing that information at some point on the globe. When rainfall information
is collected, it is important to know where the rainfall is located. This is
done by using a location reference system, such as longitude and latitude, and
perhaps elevation. Comparing the rainfall information with other information,
such as the location of marshes across the landscape, may show that certain
marshes receive little rainfall. This fact may indicate that these marshes are
likely to dry up back
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