Question

why petroleum is known as Black gold? ​

Answer 1

Explanation:

Petroleum is also known as Black Gold -

because when crude oil is extracted from the land it is black in color. People call it gold because of its oils and value . It is very difficult to find.

Answer 2

Answer:

Petroleum is called black gold because it is black in colour when extracted from the Earth. And people call it gold beacuse of its value & because of how difficult it is to find.