WORLD HISTORY

Detailed explanation-1: -Nāgārjuna () ( c. 150-250 CE) is considered one of the most important Buddhism philosophers. In some traditions, he is known as an Indian metallurgist and alchemist.

Detailed explanation-2: -Answer. The iron pillar near the Qutub Minar in Delhi was built more than 1600 years ago by the iron workers of India. They had developed a process which prevented iron from rusting.

Detailed explanation-3: -A 16th century book by Georg Agricola called De re metallica describes the highly developed and complex processes of mining metal ores, metal extraction and metallurgy of the time. Agricola has been described as the “father of metallurgy".

Detailed explanation-4: -The first metal to be extensively used by the people in India was copper. Archaeological evidence suggests that copper was first used between 8, 000 and 5, 000 B.C., most likely in the regions known now as Turkey, Iran, Iraq and toward the end of that period the Indian subcontinent.