Question

Name the following given below:
a. Largest coalfield in India.
b. Oldest oil-field in India.
c. The best variety of iron ore.

Answer 1

Hint:
The coalfield is an important contributor to the local economy, employing much of the local population either directly or indirectly.

Complete solution:
- Jharia Coalfield is a huge coal field situated in the east of India in Jharia, Jharkhand. The fields have endured a coal bed fire since 1916, bringing about 37 million tons of coal devoured by the fire, and huge ground subsidence and water and air contamination in neighbourhood networks including the city of Jharia.

- Digboi is a town and a town region board in Tinsukia area in the province of Assam, India. Raw petroleum was found here in the late nineteenth century and first oil all around was delved in 1866. Digboi is named as the Oil City of Assam. Here the primary oil well in Asia was penetrated. The primary treatment facility was begun here as right on time as 1901. Digboi has the most established oil well activity. With a critical number of British experts working for Assam Oil Company until the decade following the autonomy of India, Digboi had an all-around created framework and various homes exceptional to the town.

- Magnetite is a stone mineral and one of the principal iron metals, with the substance equation Fe3O4. It is one of the oxides of iron, and is ferrimagnetic; it is pulled into a magnet and can be charged to turn into a lasting magnet itself. It is the most attractive of all the normally happening minerals on Earth. Normally polarized bits of magnetite, called lodestone, will pull in little bits of iron, which is the way antiquated people groups previously found the property of attraction. Today it is mined as an iron mineral.

Note:
Jharia speaks to the biggest coal saves in India assessed of 19.4 billion tons of coking coal. Digboi has visitor houses and tourist residential apartments on Italian design intended to advance the travel industry in upper Assam. The synthetic IUPAC name is iron(II,III) oxide and the regular substance name is ferrous-ferric oxide.