Over millions of years, the friction of moving water may level mountains and cut deep canyons, and rock and soil removed by the water are deposited as sediment in low-lying areas.

• 经过几百万年的时间，流水的摩擦力将山弄平、将峡谷切深，且把石头土壤被水冲到下游地区沉淀为沉淀物。