Caustic Negativity

Caustic Negativity is like saltwater pounding the rocks in the ocean, After awhile, The rocks experience degradation or erosion, How can an element as light weight as water create such decay? Especially to gigantic rocks that adorn its way? Water becomes powerful collectively and uses its force to destroy suspected enemies, with enough pounding, It wears away the strength of the rocks, and the only remains that are left ........, Gravel near the docks.......