Battle Mtn, Nevada - 30x60 Minute USGS Topographic Map How-To 1955 left wreckage over a

1955 left wreckage over a wide area–and it’s still there–including both engines

Laminated maps can be framed without the need for glass

From quartz and topaz to fascinating fossils

the Hurricane Cliffs expose just over 1

Battle Mtn, Nevada - 30x60 Minute USGS Topographic Map How-To 1955 left wreckage over aThe 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