This is called a coral atoll.
thailand
No, you can call them an organism.
Atoll
A reef .
A Reefer.
an Atoll.
Geographers call an island chain an Archipelago.
The person that studies coral reefs is called a coral reef biologist. This type of scientist spends time underwater to study the status of coral reefs and also looks into the effects of other factors to the preservation of coral reefs.
Because the battle was fought in the Coral Sea, a small sea the takes up most of Australia's Northeast shore.
They call it "The Island".
You call it archipelago.
animal. Coral is a microscopic marine animal that lives together in colonies for protection. The product we call coral is actually the dead skeletons of the coral animal, "glued" together by the colony action. but technically called a marine organisms