Multiple choice

Which of the following is correct regarding ozone layer?

  1. Ozone is a non toxic gas.

  2. It protects the surface of the earth from infrared rays.

  3. The ozone hole is an annual thinning of the ozone layer.

  4. It is present in the mesosphere.

  5. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone hole is a region of marked thinning of the ozone layer in high latitudes, chiefly in winter, attributed to the chemical action of CFCs and other atmospheric pollutants. The resulting increase in ultraviolet light at ground level gives rise to an increased risk of skin cancer.

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