Topographic map, A map that shows the shape and elevation of Earth's surface using contour lines; represents three-dimensional landforms on a flat surface., Contour line, A line on a topographic map that connects points of equal elevation; shows the shape and steepness of the land., Contour interval, The difference in elevation between one contour line and the next on a topographic map; tells you how much the elevation changes between lines., Index contour, A darker, thicker contour line on a topographic map that is labeled with the elevation; usually appears every fifth line to make maps easier to read.

Chapter 2.4

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