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a) The original beauty of Taj Mahal that...

a) The original beauty of Taj Mahal that is made of marble ('CaCO_3') is gradually fading. Why?
b) Write 2 environmental problems caused by acid rains?

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a) Marble is chemically calcium carbonate. The near by industries of Taj Mahal emitted gases like .SO_2. and ,NO_2., dissolved in rain water an this caused acid rain. This acid rain react with carbonate and lost the lustre of this monument.
b) Acid rain harms the aquatic life viz. it kills fish.
Pollution of fresh water
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