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because the world would explode
If none of the sides ever cross each other, there cannot be a closed plane figure.
The NEVER cross each other
Well, isn't that a happy little question. You see, contour lines represent points of equal elevation on a map. If two contour lines were to cross, it would mean that the same point on the map is at two different elevations, which just doesn't happen in nature. So, we let each contour line peacefully hold its own space, creating a clear and beautiful representation of the landscape.
parallel lines