basic answer, they suck up calcium and other elements from the water to build their skeletons. when they die, another coral builds upon the dead skeletons.
Limestone
Limestone
Coral reefs begin to form when free-swimming coral larvae attach to submerged rocks. Both natural conditions and those created by man is what make coral reefs vulnerable to environmental stress.
I'm not 100% sure but I believe its limestone from coral reefs
The reef sits on top of thousands of years of compacted coral skeletons that have compressed and fused to form limestone rocks. So yes, there are rocks in the reef as it is principally composed of rock.
Some diseases carried by humans can infect coral reefs and scientists have just recently discovered that a form of the herpes virus is killing coral reefs.
coral reefs, rocks, and sand
Coral polyps create the large hard structures known as coral reefs. The coral grows due to the build up of calcium carbonate that the corals secret.
Coral makes up coral reefs. Coral by definition are microscopic animals with an outer skeleton of calcium carbonate that form colonies and are responsible for reef building.
no
Moro Ami is when fishermen drop large rocks into coral reefs to make the fish go out. They catch really many fish but the problem is the coral reefs are destroyed.
"Moro ami" is a traditional Filipino dish made with rice and cooked with turmeric, giving it a yellow hue. It is topped with various meats, vegetables, and boiled eggs. This dish is commonly served during special occasions and celebrations in the Philippines.
Coral Reefs
They are formed in the ocean. By some rocks and plants. Put on for hundreds of years.