Unwanted sound that is an irritant and source of stress:

1. Air pollution
2. Radioactive pollution
3. Noise pollution
4. Soil pollution

Which of the following is an example of soil pollution?

1. Disposal of solid waste in the open
2. Dumping sewage in the open
3. Overuse of fertilizers
4. All of the above.

Assertion (A): Eighty per cent of marine pollution comes from land.

Reason (R): Mining for materials such as copper and gold is a major source of contamination in the ocean.

1. Both A and R are true and R is one of the reasons for A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Given below are pictures of pollutants, classify them on the basis of degradation.