North Sister, Oregon - 7.5 Minute Series Topo Map SH-4B Whiterocks

Whiterocks

dubbed the “World’s Longest Art Gallery

Meteorites are by definition extraterrestrial objects that landed on Earth

depths of the ocean bottom

and other physical topography

North Sister, Oregon - 7.5 Minute Series Topo Map SH-4B WhiterocksThe 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