EVERYDAY SCIENCE

Detailed explanation-1: -In lakes, pesticide changes clean water into turbid water. As mentioned above, both point and non-point sources of pollution from pesticides are generally anthropogenic. So it is estimated that in surface water the toxic effects of these chemicals are caused due to anthropogenic activities that occur there.

Detailed explanation-2: -Soil pollution refers to anything that causes contamination of soil and degrades the soil quality. The soil contamination can occur due to the presence of chemicals such as pesticides, herbicides, ammonia, petroleum hydrocarbons, lead, nitrate, mercury, naphthalene, etc., in an excess amount.

Detailed explanation-3: -A direct movement of pesticides into groundwater is a common type of point source pollution, in which the pesticides enter the water wells result from pesticide spills and improper disposal of pesticides.

Detailed explanation-4: -Fertilizers are made of nutrients, such as nitrogen and phosphorus. When it rains, these nutrients are carried by storm-water into the nearest stream, river, or other water body. Too many nutrients in water can cause algae to grow, which uses up the oxygen in the water.

Detailed explanation-5: -Fertilizers used in agriculture are a significant source of nutrient pollution to water. In fact, nitrogen and phosphorus runoff from agricultural fields are some of the largest sources of pollution to coastal “dead zones” across the United States.