Multiple choice

Environmental problems does not include ________________.

  1. soil erosion

  2. pollution

  3. ozone layer

  4. global warming
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ozone layer  refers to the ozone within stratosphere, where over 90% of the earth's ozone resides. It is not an environmental problem. A thinning ozone layer is a environmental problem. It leads to a number of serious health risks for humans. It causes greater incidences of skin cancer and cataract of the eye.

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