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Scale is the ratio of map length to Earth length, Mercator projection distorts sizes of landmasses, and legends explain map symbols.
Scale: Scale of a map is a ratio of the length on the map versus the length on the Earth. It can be expressed as a numerical ratio, a labeled scale bar, or both.
Mercator projection: A map projection that distorts the sizes of landmasses, making areas near the poles appear larger than they are.
Legend: A key on a map that explains symbols used to represent features like roads, rivers, and landmarks.
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