i) All points on a contour line are of the same elevation.
ii) No two contour lines can meet or cross each other except in the rare case of an overhanging vertical cliff or wall
iii) Closely spaced contour lines indicate a steep slope
iv) Widely spaced contour lines indicate a gentle slope
v) Equally spaced contour lines indicate uniform slope
vi) Closed contour lines with higher elevation towards the center indicate hills
vii) Closed contour lines with reducing levels towards the center indicate a pond or other depression.
viii) Contour lines of the ridge show higher elevation within the loop of the contours. Contour lines cross the ridge at right angles.