Using Color to Give Information Now you are going to use the data from the table that you completed to create a chlorapleth map. A chlorapleth map is a special kind of map that uses color to show how much or how little there is of something. Think about maps you have seen with the land colored green, orange, yellow, and brown. This is a type of clorapleth map that uses color to show elevation, or how high the land is compared to the level of the sea. Here is an example of a clorapleth map that uses color to show elevation in Maryland. This map was created by the Applied Physics Laboratory of the Johns Hopkins University. The U.S. Census Bureau uses clorapleth maps to show different kinds of information. Here is a clorapleth map that shows the population density of Native Americans in the United States. Did you notice how the different colors stood for different types of information? In the map you make, you are going to use color to show something else - gain or loss in population for each county. On the clorapleth map that you will construct, the colors will show people how much or how little the population changed in Maryland between the years 1790 and 1830.

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