英语翻译Surface Water ContaminationWhat kind of contamination is

英语翻译
Surface Water Contamination
What kind of contamination is it?
Surface water is usually rain water that collects in surface water bodies,like oceans,lakes,or streams.Another source of surface water is groundwater that discharges to the surface from springs.Surface water pollution occurs when hazardous substances come into contact and either dissolve or physically mix with the water.Because of the close relationship between sediments and surface water,contaminated sediments are often considered part of surface water contamination.Sediments include the sand and soils on the bottom of an ocean,lake,or stream.