Silver Spur Ridge, Idaho - 7.5 Minute Series Topo Map Fire indicating their significance and the

indicating their significance and the unique landscapes they preserve

in commerce

deep ocean basin that paralleled the mountain chain

others found themselves in desperate situations

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Silver Spur Ridge, Idaho - 7.5 Minute Series Topo Map Fire indicating their significance and theThe 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