ÜA
reef is a mound of limestone consisting of the skeletons of corals.
ÜCoral
animals can live only below water in the top 100 feet of the sea (to get enough
light).
ÜCorals
have to process much seawater to get the CaCO3 they use to make the reef.
ÜThe
fastest known growth rates are ½ inch per year.