Yes, a map's legend/key helps the reader determine what symbols or images represent on a map. For example, if there was a brown line going a cross a river on a map, a legend/key would help the reader figure out that that symbol is a bridge.
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Christopher Columbus was the first
The soil was held together by grass roots. It was called sod. Settlers were called sodbusters because they had to break through the sod to plant crops. There was not a lot of wood, so settlers used sod to build homes.