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P.P.P.S The sea only fluctuate about 1-2 degrees in a YEAR.
This is only true of the sea as a whole, and in fact, because of global warming, the sea has increased its overall temperature instead of fluctuating. However, as was said above, water changes within a confined area, as many snorkelers and divers would attest to (a reference to the golf ball thread - shrinkage anyone?
), are much greater than 1 or 2 degrees. As the waves move water back and forth, it moves the water column back and forth, and warmer water and colder water are constantly moving and mixing on the reef. In shallow reefs as well, the temperature can become very intense, and cool off dramatically at night. Temperature is one of the least constant factors in nature when dealing with a reef, and corals can normally tolerate a wide range of temperatures.
Sorry to follow up the ppppppppppps with an opinion, not meant to be a flame, I just like to see my opinions in print, because, naturally, if it's written, it must be true!