Question

crude petroleum is also called black gold yellow gold brown gold ke white gold​

Answer 1

Answer:

can humans ever directly see a photon?

Answer 2

Answer:

Petroleum is only called Black gold . Coal is a black,hard, combustible substance . It is the mixture of carbon, hydrogen and oxygen,with small amounts of nitrogen, sulphur and phosphorus. Coal is used as a fuel for cooking food. It is used in railway engine to produce steam and thermal power station to produce electricity