Discussion
The Aravalli range is the oldest fold mountain system in India. It runs mainly through which state?
Answer: C
Correct answer: Rajasthan
The Aravalli range runs about 670 km northeast across Rajasthan, from Gujarat towards the Delhi ridge, and is among the oldest fold mountain systems on Earth - Proterozoic, well over a billion years old. Aeons of erosion have worn it down to low, rounded hills. Its highest point, Guru Shikhar on Mount Abu, reaches only 1,722 metres, a fraction of its original height. It plays an important climatic role, forming a barrier that has checked the eastward advance of the Thar Desert towards the fertile Gangetic plain - which is why its degradation through quarrying and deforestation is a live policy concern. It is rich in minerals: the marble of Makrana used for the Taj Mahal, and the zinc and lead of Zawar, among the oldest worked mines in the world. The Banas, Luni and Sabarmati all rise in it, and it divides Rajasthan into the arid west and the more fertile southeast.
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