![]() ![]() ![]() Mathematically, a contour line is a curve in two dimensions on which the value of a function f(x, y) is a constant. If you walk along a contour line you will not go uphill or downhill. A contour line is a type of isoline in this case, a line of equal elevation. Topographic maps use contour lines to show different elevations on a map. Topographic maps represent the locations of geographical features, such as hills and valleys. ![]() Mapping is a crucial part of Earth science. Rock units and geologic structures are shown on geologic maps. Maps are extremely useful to Earth scientists to represent geographic features found above and below sea level and to show the geology of a region. Explain how bathymetric maps are used to determine underwater features.Explain how to read and interpret a topographic map. ![]()
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