Question

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

Answer 1

Answer:

1) Petroleum is referred to as 'black gold' because when crude oil is extracted from the land it is black in colour. People call it gold because of its oils and value.

2)  Lignite coal is called brown coal, becase it is the lowest grade coal with the least concentration of carbon

Answer 2

Answer:

i) petroleum is black in colour when crude oil is extracted from the soil. Because of its oil and worth, people call it gold.

ii) Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon.

Explanation:

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