Contour lines are lines on a map joining points of equal height above or below sea level.

These lines, thus, represents elevation in a map. The space between the lines indicate the steepness or shallowness of any landforms.

Hence, if these lines are packed closer to each other, the landform is more steeper and gains or loses elevation quickly, and if the lines are spaced a little apart from each other, then the landform is shallower and gains or loses elevation slowly.

Based on the above information, one can match the contours in column A to the landforms in column B in the following way:

1 – B

2 – E

3 – D

4 – C

5 – F

6 – A