Further inland from the fortified walls, the cliff sloped steeply down to the plain. Tuff cones are steep sloped and cone shaped. The water fall from a height of over seventy meters surrounded by steeply sloped hills. The grandstands are sloped steeply, to improve sight lines. Both turret sides are vertical and slightly sloped. Roll return can occur when a yield curve is steeply sloped. Many Pittsburgh neighborhoods are steeply sloped with two-lane roads. The frontal glacis plate was sharply sloped to improve protection. The deck sloped downwards to the sides, but its thickness increased to . Spaced armour can be sloped or unsloped. It also sloped downwards to the sides, but its thickness increased to . It was sloped at 45 degrees from the vertical and horizontal. The skull sloped downwards at the back. The most prominent of which is the turret front changing from vertical to sloped armor. Hydroseeding is a quick, less expensive method of planting large, sloped or hillside landscapes.