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They can be any distance apart
It depends how far apart they are. It could be an infinite number.
When the contour lines are farther apart, this means that the slopes between them are gentle. On the other side, if the contour interval is smaller, the slope will be steep.
Contours for a gentle slope are spaced equally and far apart, the closer the contour lines the steeper the slope.
10 ft in the states and 30 ft apart 3 ft in Canada and 9ft apart. I'm not 100% sure about the Canada one :/