Stone quarrying in the Aravalli hills in Delhi, India

The Aravalli Range literally meaning 'line of peaks', is a range of mountains in western India running approximately 800 km in a northeastern direction across Indian states of Gujarat, Rajasthan, Haryana and Delhi. It is also called Mewat hills locally. The Aravalli range are the oldest fold mountains in India.The northern end of the range continues as isolated hills and rocky ridges into Haryana state, ending in Delhi. The famous Delhi Ridge is the last leg of the Aravalli Range, which traverses through South Delhi and terminates into Central Delhi where raisina hill is its last extension . It is one of the world's oldest mountain ranges. It's dates back to pre-Indian subcontinental collision with the mainland Eurasian Plate. The southern end is at Palanpur near Ahmedabad, Gujarat.

The Aravalli Range is the eroded stub of a range of ancient folded mountains. The range rose in a Precambrian event called the Aravalli-Delhi orogen. The range joins two of the ancient segments that make up the Indian craton, the Marwar segment to the northwest of the range, and the Bundelkhand segment to the southeast.Being rich in mineral resources, the Aravalli hills have witnessed years of illegal mining, which have led to their fast erosion in Rajasthan and Haryana. This also poses a grave environmental concern as the ranges form a natural barrier against the spread of the Thar desert northwards into the Gangetic plains in the Gangetic basin and Gujarat.

Source: Wikipedia

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