This document discusses water pollution and its causes and effects. It defines water pollution as the contamination of water bodies such as lakes, rivers, oceans, and groundwater. Some key causes of water pollution mentioned include dumping garbage in water bodies, chemical runoff from farms and factories, oil spills from ships, thermal pollution from warm water discharge, erosion, and sewage disposal. Effects of water pollution include harm to aquatic animals and plants, contamination of drinking water, and increased water-borne diseases in humans. The document suggests educating the public, implementing environmental laws, and reducing reuse and waste as methods to prevent further water pollution.