Lines used to compare some numerical values across a geographical area are called isolines, or contour lines. Isolines are useful because they are easy to pick out areas of great and abrupt change in the slope of values. They can be used to compare elevation, air pressure, pH levels, or any testable variable in the environment. This particular isoline map shows the precipitation levels of the state of Washington in the year 1996. Considering how close the lines are to the east of the state, it is safe to say that it rains much more often there than towards the west.
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