Multiple choice

Consider the following sources of air pollution: (a) Burning of garbage (b) Industrial water (c) Forest fires (d) Ash from burning volcanoes Which source(s) of pollution is/are NOT under human control?

  1. Both (b) and (c)

  2. Both (c) and (d)

  3. Both (a) and (d)

  4. Both (a) and (b)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Both forest fires and ash from burning volcanoes are the natural sources of air pollution.

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