Do you know that the water have tremendous power? Although water is a liquid, but it can also destroy stone it flows through here for a period of time. But if the water fall more energy erodes of the land may take less. Such as, horseshoe area in Niagara Falls. Water has eroded the rock until a horseshoe curve that deep more and more to 1.5 kilometer in less than 300 years. And the power of water can the waterfall shrink into 1 m. every year. (Because the stone waterfall erosion.)