Lehi, Utah - 7.5 Minute Series Topo Map washington Spanning the Four Corners area

Spanning the Four Corners area of the American Southwest

climates change

Ground-water-brine transport in sediments of the shallow-brine aquifer occurred mainly in the permeable sedimentary facies

How layers of rock reveal a record of time

This richly illustrated book will guide you to 28 outstanding rock-art sites in seven states

Lehi, Utah - 7.5 Minute Series Topo Map washington Spanning the Four Corners areaThe 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