SOLAR SYSTEM

Detailed explanation-1: -Contour lines that are close together indicate a steep slope. This is because the elevation changes quickly in a small area. Contour lines that seem to touch indicate a very steep slope, like a cliff. When contour lines are spaced far apart the slope is gentle.

Detailed explanation-2: -Closely spaced contours represent steep slopes while widely spaced contours represent gentle slope. When two or more contour lines merge with each other, they represent features of vertical slopes such as cliffs or waterfalls.

Detailed explanation-3: -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.

Detailed explanation-4: -Contour intervals reveal how much vertical distance there is between each contour line-closely spaced contour lines indicate very steep slopes. Contour lines that are sharply tapered indicate an uphill direction. Rounded contour lines typically indicate a downhill direction (gradual slope).

Detailed explanation-5: -Elevation contours are imaginary lines connecting points having the same elevation on the surface of the land above or below a reference surface, which is usually mean sea level. Contours make it possible to show the height and shape of mountains, the depths of the ocean bottom, and the steepness of slopes.