What is distillation? What kind of impurities can it remove from water?

Read the passage and answer the following questions.

Water Pollution

Water pollution is the contamination of water bodies and is harmful to the health of humans and animals. It may not damage our health immediately but can be harmful after long-term exposure. Different forms of pollutants affect the health of animals in different ways: (a) heavy metals from industrial processes can accumulate in nearby lakes and rivers. These are toxic to marine life such as fish and shellfish, and subsequently to the humans eat them. (b) Microbial pollutants from sewage often result in infectious diseases that infect aquatic life and terrestrial life through drinking water. Microbial water pollution is the major problem in the developing world, with diseases such as cholera and typhoid being the primary cause of infant mortality. (c) Organic matter and nutrients cause an increase in aerobic algae and deplete oxygen from the water column. This causes the suffocation of fish and other aquatic organisms. (d) Sulfate particles from acid rain can cause harm to the health of marine life in the rivers and lakes it contaminates and can result in mortality. (e) Suspended particles in freshwater reduce the quality of drinking water for humans and the aquatic environment for marine life. Suspended particles can often reduce the amount of sunlight penetrating the water, disrupting the growth of photosynthetic plants and microorganisms.

What is water pollution? 

Read the passage and answer the following questions.

Water Pollution

Water pollution is the contamination of water bodies and is harmful to the health of humans and animals. It may not damage our health immediately but can be harmful after long-term exposure. Different forms of pollutants affect the health of animals in different ways: (a) heavy metals from industrial processes can accumulate in nearby lakes and rivers. These are toxic to marine life such as fish and shellfish, and subsequently to the humans eat them. (b) Microbial pollutants from sewage often result in infectious diseases that infect aquatic life and terrestrial life through drinking water. Microbial water pollution is the major problem in the developing world, with diseases such as cholera and typhoid being the primary cause of infant mortality. (c) Organic matter and nutrients cause an increase in aerobic algae and depletes oxygen from the water column. This causes the suffocation of fish and other aquatic organisms. (d) Sulfate particles from acid rain can cause harm to the health of marine life in the rivers and lakes it contaminates, and can result in mortality. (e) Suspended particles in freshwater reduces the quality of drinking water for humans and the aquatic environment for marine life. Suspended particles can often reduce the amount of sunlight penetrating the water, disrupting the growth of photosynthetic plants and microorganisms.

Write any three causes of water pollution. 

Which of the following processes gives pure water suitable for drinking?

_____ pollution can lead to the spread of dysentery and cholera.

Complete the analogy:

Coagulation : help sediments settle down :: _____ (disinfection/deformation) : to kill germs.