環礁 导航菜单
地理
珊瑚礁島潟湖圓橢圓太平洋印度洋大西洋
環礁
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東沙環礁
環礁，是由珊瑚礁形成個環狀或者部分環狀個島，當中繞牢潟湖。因爲形成過程搭環境弗一樣，環礁除脫圓個之外，也有橢圓形或者其他弗規則形狀。
大部分環礁儕勒太平洋搭印度洋裏向，大西洋個環礁相對來講就少仔交關。
環礁形成過程動畫模擬
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- 地理
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