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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Sushmita
Ridge line or valley line intersects contour at right angle. If the higher values are inside the loop in the contour it indicates a Ridge. If the higher values are outside the loop in the contour it indicates a Valley. And also see the attached diagram for more clarification. [Contour lines are the lines joining the points of equal elevation on the ground surface.] Thus, correct option should be (A)