Select the INCORRECT characteristic of contour lines from the following.
1
A contour passes through any point perpendicular to the line of the steepest slope at that point.
2
Two contour lines of different elevations cannot cross each other except in the case of an overhanging cliff or a cave.
3
Contour lines of different elevations can unite to form one line in a vertical cliff.
4
Contour lines are parallel to the watershed line.