his complete (almost) seawater model was composed of nine components: HCl, H2O and CO2 are acids that correspond to the volatile from the earth; KOH, CaCO, SiO2, NaOH, MgO and Al(OH)3 correspond to the bases of the rock. if there was an equilibrium assemblage of nine phases, the system would have only two independent variables. S argued that a plausible set could include a gas phase and a solution phase and the following seven solution phase and the following seven solid phases