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17) Black smoke rises in the air from a factory in Georgia. The black smoke is a pollutant. When this pollutant returns to Earth it becomes acid rain. How does the acid rain change the plants' and animals' environment?

AIt helps clean up the pollution.
BIt helps them build a new habitat.
CThe plants and animals are harmed.
DIt adds nutrients to the environment.

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C) The plants and animals are harmed.

The correct answer is C) The plants and animals are harmed.

On burning of fuel in power stations, vehicles, factories emit smoke which contains lots of invisible gases which are invisible. Some of the gases such as nitrogen oxides and sulphur dioxide react with the water droplets in clouds to form sulphuric and nitric acids. The rain from these clouds falls on the Earth as “acid rain". The acid rain is harmful to our environment. It is source of pollution and when it falls it can have a serious effect on soil, trees, animals, buildings and water.

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