Question

what are contour lines ? How are they useful?

Answer 1

Answer:

Contour lines are lines drawn in the map connecting points of equivalent elevation,meaning if you physically followed a contour line elevation would remain constant.

They are useful as they illustrate the shape of the land surface, it's topography on the map.

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Answer 2

Answer:

Contour lines are the imaginary lines that join points of equal elevation on the surface of the earth above or below a reference point such as mean sea level

Explanation:

These lines form a network or grid of squares.