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5. Our Environment
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Q18 of 163 Page 241

Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth's surface.

Ozone layer in the stratosphere absorbs the harmful ultra violet radiations coming from the sun and thus prevent from reaching the earth surface.


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16

What is ten per cent law? Explain with an example.

17

Write the full form of CFC. Give its one harmful effect.

19

What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner?

20

Explain how harmful chemicals enter our bodies.

Questions · 163
5. Our Environment
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