What is acid rain?

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Explanation:

the falling of rain mixing with acid is called acid rain.

Generally , the mixing of acidic materials in rain water is called acid rain. The chemicals like sulphur dioxide, nitrogen oxide, etc. are responsible for acid rain .

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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