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Topographic map

a map that shows the surface features or topography of the Earths surface

Elevation

height of an object above sea level

Contour line

A line on a topographic map that connects points of equal elevation

USGS

A federal government agency that makes the topographic maps for the United States

Contour interval

the difference in elevation from one contour line to the next

Relief

the difference in elevation between the highest and lowest parts of an area

Index contour

A darker, heavier contour line that is usually every fifth line and that is labeled by elevation.

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