Erosion over millions of years inevitably destroys all volcanic islands. Great pieces of the island will submerge, leaving only a ridge of cliff in the ocean. Despite this destruction, animals have evolved to live on these dying islands.
Volcanic islands eventually erode and sink back into the sea. The island of Espanola in the Galapagos is 4 million years old and sinking fast. But as it dies, it offers new opportunities for all sorts of animals.
There are many reasons why the Galapagos Islands were so influential to Charles Darwin. The sheer isolation of the islands, their unique geography, water currents and broad variety of environments all proved to be instrumental in supporting the theory of natural selection.
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