Contour line is the imaginary line joining places of equal

Question: Contour line is the imaginary line joining places of equal :
(1) Rainfall 
(2) Humidity
(3) Elevation 
(4) Temperature

Answers: (3) Elevation 
Contour line is a line on a map or chart joining points of equal height (elevation) or depth. Closely
spaced contour lines indicate a steeper grade than the more loosely spaced lines.

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