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the term "environmental geology" has shifted in emphasis from the study of geologic hazards to the study if air

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Mt Elmer, Utah - 7.5 Minute Series Topo Map Mexico the term "environmental geology" hasThe 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