Nahnek Mtn, Idaho - 7.5 Minute Series Topo Map Astronomy Dayna Stern and her retrievers

Dayna Stern and her retrievers

With miles of mapped trails including a portion of the Pacific Northwest Trail

Pages: 404

A flood of catastrophic proportions

interested in learning how to identify wildflowers

Nahnek Mtn, Idaho - 7.5 Minute Series Topo Map Astronomy Dayna Stern and her retrieversThe 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