Correct Answer - Option 3 : saddle down the hill
Explanation:
Contour: A Contour line may be defined as an imaginary line passing through the points of equal elevation.
Characteristics of Contour line:
1) All the points on a contour line have the same elevation.
2) The elevations of the contours are indicated or printed close to the contour.
3) When no value is present it indicates a flat terrain.
4) A zero meter contour line represents the coastline.
5) Two contour lines do not intersect or cross each other except in the case of an overhanging cliff or a cave penetrating a hillside.
6) Equally spaced contour represents uniform slope and contours that well apart indicate a gentle slope.
7) A set of close contours with higher figures inside and lower figures outside indicate a hill lock.
8) Whereas in the case of depressions, lakes, etc the higher figures are outside and the lower figure is inside.
9) A watershed or ridgeline and valley line cross the contours at right angles.
10) Irregular contours represent the uneven ground.
11) The direction of the steepest slope at a point on a contour is at the right angle to the contour.
12) A part of the land in from of the tongue which just out from the hilly area is known as a spur.
The contour gradient for a highway is set out from the saddle down the hill.
