Atoll reefs form lagoons.
The plural of 'reef' is reefs.
Atoll reefs usually only form where stony coral growth is quite rapid. They are far more common in pacific reefs than atlantic. However, an atoll is simply a coral reef that encloses a lagoon, and technically they could form anywhere where reefs form.
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.
Joe Ghiold has written: 'Carbonate production by the coral Diploria labyrinthiformis from south Florida patch reefs'
red
The word patch is singular, not plural. The plural form is patches.
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.
it contain calcium and if spoiled it causes tsunami.
fringing veins
they have a branch and twist it to form a circle wich is a reef
Continental shelf