The main difference between soft and hard corals is that hard corals produce and leave behind a rock
The main difference between soft and hard corals is that hard corals produce and leave behind a rock-like skeleton as they grow, made of calcium carbonate - CaCO3 (the same substance that chalk and Tums is made out of). It is these calcified skeletons that together make up the primary structure of a coral reef, which can eventually grow to the size of a mountain range. A good example is the Great Barrier Reef, which despite recent mass bleaching is still presently the largest living thing on Earth and is visible from space - photo taken at Foammulah Atoll, Indian Ocean -- source link
#maldives#tropical reefs#indian ocean#tangfish#scuba diving#curiomo#beauty#oceans#aquatic#潛水#스쿠버다이빙#スキューバ#divers#nature#natgeo#paditv#colorful#wall diving