Contour Lines Practice #1 Draw in contour lines at the following elevations (all numbers are given in feet above sea level): 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750 350 400 400 350 350 300 250 B 450 500 500 450 450 400 300 550 600 600 550. 500 450 350 600 650 650 600 550 500 400 650 700 700 650 600 550 450 650 750 700 650 600 550 500 600 650 650 600 550 500 450 O km 5 km 10 km Calculate the gradient from point A to point B If you cut through the land from C to B, what would the cross section look like? Draw it. (This is called a PROFILE.)