A reef than surrounds a volcanic island is an : Atoll
Atoll usually takes shapes in a form of ring that surround the areas of volcanic island that consist of corals. It usually only exist in warm waters, so volcanic islands will provide perfect environment for the corals
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It was Lexi that was killed by Damon in season 1.
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I agree that atmospheric temperature drops at higher altitude because it causes heat at a higher temperature. The ozone layer shields the world from other temperature and anything else that could affect the global atmosphere.
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