NATURAL GAS (NG) FUEL CHARACTERISTICS Natural gas is a fossil fuel that is extracted from underground reservoirs.
(NATURAL GAS (NG) FUEL CHARACTERISTICS Natural gas; is; a fossil fuel that is extracted from underground reservoirs) (a fossil fuel; is extracted; from underground reservoirs)
NATURAL GAS (NG) FUEL CHARACTERISTICS Natural gas a fossil fuel
is is extracted
a fossil fuel that is extracted from underground reservoirs
from underground reservoirs