Revision Notes for CBSE Class 8 Science Pollution of Air and Water Chapter 18 - Free PDF Download
FAQs on Pollution of Air and Water Class 8 Notes CBSE Science Chapter 18 (Free PDF Download)
1. Define air. Mention the names of the various components of air.
Air is a mixture of several gases. It is both invisible and odourless. The various components of air are:
Oxygen
Nitrogen
Carbon dioxide
Argon
Methane
Water vapours
2. What do you understand about air pollution? Mention some sources of air pollution.
Air pollution is the phenomenon in which fresh air is contaminated by unwanted substances like smoke and various chemicals. Some of the major sources of air pollution are:
Dust and smoke that is caused by a forest fire
Carbon monoxide that is released from the burning of diesel and petrol
Burning of woods
Automobile exhausts
Smoke from factories
3. What is smog?
Smog can be defined as the combination of both smoke and fog. It can contain oxides of nitrogen and other pollutants that are usually released in the air. Smog can cause asthma, cough, and other respiratory problems. Smog also causes an increase in accidents due to various visibility issues.
4. What are the harmful effects of acid rain?
Acid rain is when rain falls and brings with itself various pollutants like nitrogen oxide and sulphur dioxide. Acid rain is harmful to both animals and plants which are living in water bodies and on land. Acid rain causes an increase in the acidity level of water. It also damages statues and buildings.
5. What key topics are covered in "Pollution of Air and Water" Class 8 CBSE Chapter 18 notes?
The notes cover crucial aspects like sources, types, and effects of air and water pollution, providing a comprehensive understanding of the chapter.