'Petroleum as it comes to the surface is called this; that's why it has to be refined'
Crude oil
OIL: Petroleum as it comes to the surface is called this; thats why it has to be refined
Petroleum as it comes to the surface is called this; that's why it has to be refined
Petroleum as it comes to the surface is called this; that's why it has to be refined
"OIL"
Crude oil
"OIL"