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It provide the colors, symbols,or markers on the map mean.

Keys are used such that small symbols, colors, etc. can be used without having to include explanations next to each. For example, you don't have to write "Road" or "Forest" or "Town with population less than 2,500" next to each item. You can represent using a color, symbol, or marker and just say what it means in the key.

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12y ago

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