Question

Why petroleum is called black gold?Which type of coal is called brown coal? ​

Answer 1

Answer:

Petroleum is referred to as Black Gold. This name itself is an indication of its importance to humans. It is called black gold because. It is black in colour when crude oil is extracted from the soil.

Explanation:

Answer 2

Answer:

Petroleum is referred to as Black Gold. This name itself is an indication of its importance to humans. It is called black gold because. It is black in colour when crude oil is extracted from the soil.