Nogales, Arizona - 30x60 Minute Series Topo Map Multihazard Studies and fields of wildflowers

and fields of wildflowers

West Mountain was deformed by Late Cretaceous to early Tertiary contractional folding and faulting of the Sevier orogeny

from lightning to blisters

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field work in the western states and Alaska

Nogales, Arizona - 30x60 Minute Series Topo Map Multihazard Studies and fields of wildflowersThe 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