Gerlach, Nevada - 30x60 Minute USGS Topographic Map UGS M Published: (1990 field trip) 1991

Published: (1990 field trip) 1991

True to the basic structure most of its mountain ranges generally trend north-south

Pages: 476

by Winston M

Gerlach, Nevada - 30x60 Minute USGS Topographic Map UGS M Published: (1990 field trip) 1991The distinctive characteristic of a topographic map is that the shape of the Earth's surface is shown by contour lines. Contours are imaginary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steepness of slopes. A topographic map shows more than contours. The map also includes