Molecular interactions of Water and Silica Jan 25, 2021 7:26:33 GMT -7 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by 1dave on Jan 25, 2021 7:26:33 GMT -7 The TWO Major Molecules on Earth's Surface are Water - H2O (70% of Earth's Surface) and Silica - SiO2 (59% of Earth's Crust).They are composed of just Three Elements:Hydrogen:Oxygen:Silicon: