Mysterious donut-shaped islands in the middle of the Pacific and Indian Oceans? You probably know them as popular tropical resort destinations like the Maldives and Tahiti. But can you guess how they were formed?
Charles Darwin, the famed naturalist for the origin of species, laid out his theory of these structures might have come to be over millions of years. Yes, they have to do with volcanoes, but not in the way you might assume.