granite rock and algae in shek o coast in hong kong

acid acidic algae background beach beautiful blue calcium calm carbonate china chloride close closeup clouds coast coastline coasts color colorful composition cross crossline crosslines dioxide dusk erosion fossil geo geography geology gold golden granite green habitat hard hill hills hong igneous jade joint joints kong landscape lichen lichens light lines marine metamorphic minerals mosses mountains ocean oceans rock rocks rocky sand sands sandy sea seaweed sedimentary sharp shek silicon stone stones temperature travel water waves