Multiple choice

Which of the following statements is correct?

  1. Ozone is a non-toxic gas.

  2. The ozone layer protects the surface of Earth from infrared rays.

  3. Ozone hole is a region of marked thinning of the ozone layer at high altitudes.

  4. Ozone is present in the mesosphere.
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C Correct answer
Explanation

Ozone hole is a region of marked thinning of the ozone layer at higher altitudes. It is a toxic gas and the ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation.  

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