Contours are imaginary lines showing

Question: Contours are imaginary lines showing
(1) places of equal atmospheric pressure
(2) same temperature areas
(3) places of equal altitudes
(4) equal sunshine areas

Answer: (3) places of equal altitudes
In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above
a given level, such as mean sea level. Contour lines are curved or straight lines on a map describing the
intersection of a real or hypothetical surface with one or more horizontal planes. The configuration of these contours allows map readers to infer relative gradient of a parameter and estimate that parameter at specific places.

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