a simple is made of one or more lithosphere chemically combined
lithosphere is layer. one_of_chemical_elements is radon. one_of_chemical_elements is gadolinium. ethephon is chemical_compound. cracking is chemical_process. aluminum_combined_with_oxygen is called_alumina. methomyl is chemical_compound. chemical_bonding is connecting. diphosgene is chemical_compound. surface_chemistry is chemistry.