A. A contour is not necessarily a closed curve
B. A contour represents a ridge line if the concave side of lower value con¬tour lies towards the higher value contour
C. Two contours of different elevations do not cross each other except in case of an overhanging cliff
D. All of the above statements are correct
Correct Answer: Two contours of different elevations do not cross each other except in case of an overhanging cliff ✔
Last Updated: January 12, 2019