Marine snow, detritus from the creatures swarming in the sunlit waters above. 海雪是海洋表面上的生物产生的小型有机物碎屑
this reef does not contain the greatest variety of marine life on the planet. 这里珊瑚礁也不可能容纳全部的海洋生物
but these coral havens contain one quarter of all the marine life on our planet. 不过珊瑚礁汇聚着地球上四分之一的海洋生物
but they contain the vast majority of it's marine life. 不过大多数的海洋生物都生活在这里
Limestone is composed of minerals derived from marine shells and corals, 石灰岩由海螺和 珊瑚中的矿物沉积后形成