Crude oil but there are several different grades of crude.
It is called Crude Oil
Crude oil
It is called oil drilling or petroleum extraction.
Crude Oil
Crude Oil
Crude oil.
Crude Oil
Coal still in the ground is called "coal reserves".
Crude oil.
The equipment used to extract oil from the ground is called an oil rig or drilling rig. It is a complex structure designed to drill deep into the Earth's surface to reach oil reservoirs.
its i dont know because this crossword sucks
Coal that is still in the ground is referred to as coal seam or coal deposit.