Jim Sage Canyon, Idaho - 7.5 Minute Series Topo Map Cambrian Numerous smaller towns sprang up

Numerous smaller towns sprang up to service the railroad

from the 1999 Megatrench Site

Nitrate contamination of the Moroni

The book begins with geology basics

By: Leslie Kelen

Jim Sage Canyon, Idaho - 7.5 Minute Series Topo Map Cambrian Numerous smaller towns sprang upThe 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