What do the following colours represent? Blue - Red - Yellow - Green - Brown - Black - Purple -

Ans Blue - lakes, rivers, streams, oceans, reservoirs, highways, local borders etc.

Red - major highways, roads, urban areas, airports, special interest sites, military sites, place names, buildings, borders.

Yellow - built-up or urban areas.

Green - parks, golf courses, reservations, forest, orchards, highways.

Brown - deserts, historical sites, national parks, military reservations or bases, contour (elevation) lines.

Black - roads, railroads, highways, bridges, place names, buildings, borders.

Purple - highways (also used on U.S.G.S. topographic maps to represent features added to the map since the original survey).