Natural gas on top of the oil. Natural gas is less dense.
Oil and natural gas.
Natural gas, just like oil, is a fossil fuel
Oil and natural gas are fossil fuels.
No natural gas is natural gas.
No natural gas is natural gas.
Oil, natural gas, fishing
natural gas comes from the earth where as oil is processed
crude oil and natural gas
oil and natural gas reserves are found in
Oil and natural gas are both "fossil" fuels.
The three main fossil fuels are coal, oil and natural gas