CASE STUDY-THE TAJ MAHAL

Colour of Taj Mahal in Agra is changed due to

Corrosion of Taj Mahal is due to the conversion of CaCO_(3) into

Why is it advised that industries should switch over to cleaner fuels such as CNG and LPG in the Taj Mahal Zone in Agra?

Join or combine each pair of sentences into one sentence, using who, whose, whom, which or that: The Taj Mahal was built by Shahjahan. It is the finest tomb in the world.