GEOLOGY

Detailed explanation-1: -Widely separated contour lines indicate a gentle slope. Contour lines that are very close together indicate a steep slope.

Detailed explanation-2: -In hilly areas, the contour lines are close together while they are wider apart on flat slopes. The closer the contour lines, the steeper the slope. The wider the contour lines, the flatter the slopes.

Detailed explanation-3: -Closely spaced contour lines indicate steep slopes. Widely spaced contour lines indicate gentle slopes or relatively flat areas. A contour line that forms a closed loop with no other contour lines inside indicates a hilltop. Contour lines form “V” shapes in streams.

Detailed explanation-4: -This is because when contours are close together, it means that the slope is steeper. For a quick definition, a contour line joins points of equal and constant values. For example, contours on an elevation have constant heights that are the same on each line in a topographic map.

Detailed explanation-5: -Steep slopes are legally defined as hillsides having a 15 foot, or greater, vertical rise over 100 feet of horizontal run, or 15% slope (Figure 1). They are often undesirable ar-eas for development due to the difficulty of building on steep grades.