Question

To write about "contour lines"?
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Answer 1

Answer:

 contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. ... As a contour approaches a stream, canyon, or drainage area, the contour lines turn upstream.

Answer 2

A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. ... As a contour approaches a stream, canyon, or drainage area, the contour lines turn upstream.