310 WK2 DB2 RES1 (75 WORDS)
Water pollution is caused by natural events such as a volcano eruption and flooding. These natural disasters challenge the quality of water that we receive. Another primary challenge is controlling nonpointsource pollutants; these are areas in which pollution occur but are difficult to trace where they began. Such as runoffs created by logging, sewage disposal and agricultural runoff, because it is difficult to locate these […]