Cascade Wall Fountain

cascade, waterfall, especially a series of small falls, consisting of water descending over rocks or boulders. It may be natural or it may be artificial.Streams that flow from soft rock to hard rock frequently generate waterfalls. This occurs both laterally (as a stream flows across the earth) and vertically (as a mountain range rises) (as the stream drops in a waterfall). The soft rock erodes in both circumstances, leaving a firm ledge over which the stream flows.