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[Stockbild] Volcanic island. Aerial photograph of a lush green volcanic island off the coast of Myvatn, Iceland. The craters seen are known as pseudo-craters, which formed when hot gases bubbled through the lava as it set to form the island. The vegetation that grows on this island is mown by local farmers and stored for winter fodder for sheep. (KEYSTONE/SCIENCE PHOTO LIBRARY/BERNHARD EDMAIER) === ===