Most caves are formed by limestone , a carbonate rock .
大多数洞穴是由石灰岩形成的，这是一种碳酸盐岩。
Sea life makes carbonate shells from this runoff .
海洋生物使碳酸盐的壳流失。
Like most other islands in the bahamas , cat island is located on a large depositional platform that is composed mainly of carbonate sediments and surrounding reefs .
和巴哈马其他许多岛屿一样，卡特岛位于一个主要由碳酸盐沉积物构成的巨大台地上，周围被珊瑚礁环绕。
Exotic and colorful , coral reefs aren 't lifeless rocks ; they are made up of living creatures that excrete a hard calcium carbonate exoskeleton .
形状奇特，颜色丰富，珊瑚礁并不是一般意义上的石头，而是一种生物分泌钙化碳酸盐的坚硬外骨骼。
That is bad because many marine creatures rely on shells made of calcium carbonate to protect themselves .
