Topography - The shape of a geographical area, Contour line - A line on a map that connects points of equal elevation, Elevation - The distance above sea level of a point, Index Contour - A bold, darker contour line labeled with the elevation. Usually every 4th or 5th line, Relief - The difference between the highest and lowest points in an area, Contour Interval - The amount the elevation changes between contour lines. , Benchmark - The point where an exact elevation has been measured and recorded,

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