ECONOMICS (CBSE/UGC NET)

Detailed explanation-1: -However, toxic chemicals such as arsenic and fluoride can be dissolved from the soil or rock layers into groundwater. Direct contamination can also occur from badly designed hazardous waste sites or from industrial sites.

Detailed explanation-2: -All forms of pollution eventually make their way to water. Air pollution settles onto lakes and oceans. Land pollution can seep into an underground stream, then to a river, and finally to the ocean. Thus, waste dumped in a vacant lot can eventually pollute a water supply.

Detailed explanation-3: -A lot of water pollution comes from human activity. Some human causes include sewage, pesticides and fertilizers from farms, waste water and chemicals from factories, silt from construction sites, and trash from people littering. Some of the most famous incidents of water pollution have been oil spills.

Detailed explanation-4: -Water pollution happens when toxic substances enter water bodies such as lakes, rivers, oceans and so on, getting dissolved in them, lying suspended in the water or depositing on the bed. This degrades the quality of water.

Detailed explanation-5: -Domestic sewage, industrial wastes, pesticides, fertilizers, synthetic detergents, chemicals, oil and grease are water pollutants. The presence of pollutants make the water foul-smelling and bad in taste. Sometimes, oil or grease is found floating over it.