Select the correct statement. A. A contour is not necessarily a closed curve B. A contour represents a ridge line if the concave side of lower value contour 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

The correct answer is D. All of the above statements are correct.

A contour is a line on a map that connects points of

equal elevation. It is not necessarily a closed curve. For example, a contour line can be a line that runs along the top of a mountain, or it can be a line that runs along the bottom of a valley.

A contour represents a ridge line if the concave side of lower value contour lies towards the higher value contour. This is because the concave side of a contour line is always facing downhill.

Two contours of different elevations do not cross each other except in case of an overhanging cliff. This is because the elevation of a point on a contour line is always the same. If two contours of different elevations crossed each other, then there would be two points on the map with the same elevation, which is not possible.

In conclusion, all of the above statements are correct.