Question

4.Due to its great ------- importance ------

is also called black gold.​

Answer 1

Answer:

Pepper is called black gold........

Explanation:

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Answer 2

Answer:

Petroleum

Explanation:

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. Because of its oil and worth, people call it gold.