What is meant by ozone depletion?

Answer in Brief

Ozone is present in the upper layer of the atmosphere called the stratosphere. It protects the earth from harmful ultraviolet rays of the sun.
Some air pollutants, like chlorofluorocarbon (CFC), react with ozone present in the atmosphere. These pollutants reduce the density of the air.
The ultra-violet rays from the sun reach directly on the earth, which affects human health, causing skin diseases and cancer and also increase the earth’s temperature.

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Chapter 6: Air and Atmosphere - Exercise 3

Chapter 6 Air and Atmosphere
Exercise 3 | Q 4

What is greenhouse effect?

What is wind?

Tick (√) the correct alternative from the choice given for the following statement.

Air pollution is due to the

What is meant by the term ‘atmosphere’? State the role played by the atmosphere for the survival of mankind.

State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.

Air is a mixture and not a compound since the components of air cannot be separated by physical methods.

Water does not have a ______ but has definite ______ and ______.

Match the statements in List I with the correct answer from List II.

List I	List II
1. The constituent of air which is around 0.02%	A: Nitrogen
2. The constituent of air which is inert or unreactive	B: Oxygen
3. The constituent of air which is non-combustible, but supports combustion.	C: Sulphur dioxide
4. A pollutant in air responsible for acid rain	D: Carbon dioxide
5. The main rare gas present in air.	E: Argon

Fill in the blank:

The gas evolved as a product of combustion as well as respiration is ______.

Mention two uses of air.

Air has no ______ & ______.