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Answer : 4 Sirohi in Rajasthan Explanation : Answer: D) Sirohi in Rajasthan Explanation: A big bed of rock salt with the top portion of the bed containing potash (though not the variety used as ferilizer) has been discovered in Thar Desert at a depth of 100 metres. A massive belt of lead and zinc has been found in the Agucha area, while gold bearing rocks have been discovered in the Tuensang district of Nagaland.

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