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Colors are used on maps to differentiate between layers such as rivers, oceans, land, roads, country/state/county boundaries, etc.

A weather overlay on a map has its own color codes to represent rain, snow, as well as other severe weather warnings/advisories .

Income, population and similar density maps (e.g. birth-rate, death-rate, age, etc.) likewise use colored areas to represent various information and Demographics within a given area.

Color, line-style, icon shapes, transparency, and fill patterns are all techniques used to visually convey multiple pieces of information.

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