Because oil is worth a lot of money, just like gold, and it is black, hence the term, "Black Gold"
commenly oil is called liquid but some times petrol is also called liquid gold :v
Crude oil, from which petroleum is derived, is referred to as 'black' gold. Liquid gold is often used to refer to certain alcohols with an amber hue like beer, cider, whiskey and brandy
Black Gold is OIL, and ALL benefit in some way. It is converted into petrol and lubrication's for machinery.
Oil was called black gold in the early 1900'2
petrol, fuel, the dark gold...
Oil was called black gold in the early 1900'2
it is called a black fish with a gold stripe(:
It's not a crop but oil is called back gold.
iron
petroleum
Crude oil
cocoa is called black gold because tha is how they named it