Question

how can you say contoar lines and mean sea level are use full to us?​

Answer 1

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.

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.