a simple is made of one or more lithosphere chemically combined
cracking is chemical_process. surface_chemistry is chemistry. diphosgene is chemical_compound. one_of_chemical_elements is gadolinium. methomyl is chemical_compound. aluminum_combined_with_oxygen is not called_alumina. lithosphere is layer. ethephon is chemical_compound. aluminum_combined_with_oxygen is called_alumina. chemical_bonding is connecting.