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Which is among the greatest contributors to gaseous pollutions that are responsible for acidic rain?

1. Electrical power generation using coal
2. Earthquakes
3. Air pollution
4. All of the above

Correct answer: Electrical power generation using coal

Solution

Coal-fired power plants emit sulfur dioxide and nitrogen oxides, which react in the atmosphere to form acids that fall as acid rain. The other choices are not major direct contributors in the same way.

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