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Explain how, harmful ultraviolet radiati...

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

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Harmful ultraviolet radiations from the sun causes:

The most harmful of ultraviolet radiations are

Ultraviolet radiations from sunlight causes a reaction that produces:

Harmful ultraviolet rays coming from sun are absorbed by

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. TEN PER CENT LAW

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

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  3. Explain how, harmful ultraviolet radiations of sunlight are prevented ...

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  4. What are the causes of depletion of ozone layer ? Which diseases are l...

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  5. Explain how harmful chemicals enter our bodies.

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  6. If we excessively use pesticides to protect the crops from diseases, t...

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  7. What is meant by biological magnification ? With the help of a food ch...

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  8. What is meant by bioconcentration of pesticides ? Which common pestici...

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  9. What is garbage? What does garbage consist of ?

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  10. MODES OF WASTE DISPOSAL

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  11. How can the wastes such as paper, plastic and metal objects be dispose...

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  12. Give a method for the disposal of household wastes such as left-over f...

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  13. What is meant by incineration? For what purpose is it used ?

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  14. How are most of the solid wastes in urban areas disposed of?

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  15. State two advantages of using disposable paper cups over disposable pl...

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  16. What is sewage ? How is sewage disposed of ?

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  17. EFFECTS OF OZONE DEPLETION

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  18. What would happen if the ozone layer in the atmosphere completely disa...

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  19. (a) With the help of a flow diagram, describe how energy from th sun f...

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  20. (a) What is ozone ? How is it formed ? (b) How does ozone layer prot...

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