Question

How can you say counter lines and mean sea level or useful to us

Answer 1

Answer:

 Contour line,is a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level.

Explanation:

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Answer 2

Answer:

Contour line is a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level.