Final answer:
Atolls are circular islands formed from eroded volcanic islands over time, leaving a central lagoon. This erosion process leads to the transformation of high islands into low islands and eventually atolls.
Explanation:
Atolls are circular or semi-circular islands formed from eroded volcanic islands that have mostly disappeared, leaving a central lagoon where the volcano used to be. These atolls are a result of long-term erosion of volcanic islands, such as the older volcanoes of the Hawaiian/Emperor seamounts. The process of erosion over thousands of years leads to the transformation of high islands into low islands, which can eventually become atolls.
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