(subclass FossilFuel Fuel) | Mid-level-ontology.kif 1680-1680 | Fossil fuel is a subclass of fuel |
(subclass FossilFuel PetroleumProduct) | Mid-level-ontology.kif 1681-1681 | Fossil fuel is a subclass of petroleum product |
(subclass LiquefiedPetroleumGas FossilFuel) | Mid-level-ontology.kif 1698-1698 | Liquefied petroleum gas is a subclass of fossil fuel |
(subclass Gasoline FossilFuel) | Mid-level-ontology.kif 1702-1702 | Gasoline is a subclass of fossil fuel |
(subclass DieselFuel FossilFuel) | Mid-level-ontology.kif 1707-1707 | Diesel fuel is a subclass of fossil fuel |
(subclass Coal FossilFuel) | Geography.kif 2018-2018 | Coal is a subclass of fossil fuel |