What is the natural gas?
Natural gas is a hydrocarbon,it is made up of compounds of hydrogen and carbon. Natural gas is a flammable gas, consisting largely of methane and other hydrocarbons. It occurs deep inside the earth either alone or covering the crude oil in an oil-field is called natural gas.
Why is petroleum called black gold?
Petroleum is used in many commerical work. Due to its great commercial importance, petroleum is called black gold.