Shelves of coral surround the Pacific island of Palau. Corals, small organisms related to anemones, secrete calcium carbonate which hardens into an exoskeleton and over time forms reefs.

• 意译：珊瑚礁：图片画廊。珊瑚的架围绕太平洋帕劳的岛屿。珊瑚，小的生物体与海葵相关，分泌碳酸钙变硬到外骨架里和随著时间的推移形成暗礁。