sun, underwater grotto and snorkeler

acidification and animal archipelago area barrier beautiful biodiveristy biodiversity biology bright change climate colony colorful colors conservation coral corals crevice diverse diversity diving down ecosystem environment fish fragile grotto grows habitat health healthy invertebrates island islands kayaking known lagoon life limestone marine micronesia natural nature niche ocean pacific palau park reef reefs region remote research rock scene scenery scenic science scuba sea seascape small snorkeler snorkelers snorkeling species sun sunlight surface swims tropical tropics underwater water wildlife