16.It is a material produced naturally or artificially that harms the environment.

a agent

b. pollutant

c. trash

d. toxic chemical

17.This happens when there is a sudden unfavorable change in the characteristics of air, water, and land.

a. contamination

b. ecological imbalance

e impurity

d. pollution

18.Carbon dioxide is a pollutant found in

b. radiation

C. soil

d. water

19. Which of the following best describes biodegradable pollutants?

a. An example of this material is domestic sewage

b. A massive quantity of these materials causes harm to the environment.

c. These are materials that decompose slowly through natural or artificial methods.

d. A material that quickly decays and piles up and may result in damaging the

ecosystem.

20. The following are example a. DDT

b. Metallic oxides

of non-degradable pollutant except:

c. paper

d. salt

21.It is a fog combined with smoke and other chemical fumes.

a. dirty smoke b. exhaust gas

c. smog el. vapor

22. They are a combination of substances emitted directly from various sources.

a. biodegradable pollutants

b. non-degradable pollutants

c. secondary pollutants

d. tertiary pollutants

23. The following describes water pollution except:

a. A degradation caused by aerosols.

b. An occurrence that contaminates bodies of water.

c. Primary source of this pollution comes from food wastes, mineral oils, and

detergents.

d. It is a conditions where materials are found in water which harms the environment.

24.It is an example of a common air pollutant.

a chlorine

b. fertilizer

c. hydrocarbon

d. supersonic airplane

25. It has high energy and removes electrons, and it is highly dangerous to protoplasm

a atom

b. chemical

c. radiation

d. hazardous material​