Tuvalu's formation was something discussed at length, by various scientific boards, because of the unusual nature of the coral formation around Tuvalu. Tuvalu's reefs are generally shallow, like most coral is, because the sunlight and warm water is neccesary to facilitate coral growth. The odd thing about Tuvalu though is, there is a vast amount of dead coral skeleton well below 80 metres in the water surrounding Tuvalu. This positively confused scientists, and evantually they came to the conclusion that Tuvalu had been formed on an area of volcanic activity, where cral had flourished, and over time the volcanic support for the area sank lower and lower, and more coral grew over it. It is this growth that formed the foundations of Tuvalu, this theory was put forward by Charles Darwin, in 1842, and was confirmed by The Royal Society Of London when they bored into the ground and took samples of the strata. You can still see these bore holes, and they are known as the tourist attraction, David's Drill.
Tuvalu is situated in a tropic, and has year long, warm temperatures [29c] , and is generally a humid climate.
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