Explanation:

Geological survey of india

• The GSI is a government organisation in India, attached to the Ministry of Mines for conducting geological surveys and studies.
• It is one of the premier organisations of earth science survey and research in the world.
• The GSI was established in 1851 and is one of the oldest of such organisations in the world and the second oldest survey institution in the country.
• It is the prime provider of basic earth science information to the government, industry and the general public.
• Its main function is related to creation and updation of national geoscientific information and mineral resource assessment.