List the three major constituents of sewage.

Fill in the blanks:

(i) Rubber particles and dust raised by running motor vehicles are examples of .................... pollutants.

(ii) Too frequent exposure to.................... in a medical diagnostic technique may damage chromosomes.

(iii) Thermal power plants give out a lot of .................... waste water.

(iv) Sewage is a liquid waste from………

List two major harmful effects of each of the following:

(i) Rivers contaminated with sewage.

(ii) Too much gaseous exhausts containing CO₂ and SO₂.

(iii) Pesticides such as DDT used in agriculture.

(iv) Prolonged noise such as the one produced by crackers throughout the night.

What are three common sources of oil spills, and how do they affect sea life.

Mention any two measures to minimize noise pollution.