Answer:
Coal steel
Step-by-step explanation:
Coal is an essential fossil fuel for the industrial sector. In addition to providing a lot of energy for the operation of machinery in the steel industry, this element is indispensable for the transformation of iron ore into steel, which is an indispensable element in all industrial sectors.
For this reason, we can say that a society that wants to industrialize or improve its industrial sector needs to invest in coal mining, especially metallurgical coal.