An underwater volcano in the Pacific, which recently gave birth to a new island, has erupted once again, unleashing plumes of ash and smoke into the sky, as revealed in footage released by the Japan Coast Guard.The volcanic activity occurred off the coast of Japan's Iwo Jima island, situated in the southern part of the Izu-Ogasawara arc. This underwater volcano first erupted on Oct. 21, with heightened activity recorded in the subsequent days. By Oct. 30, explosions were happening every few minutes, propelling rocks and ash into a growing pile about 0.6 mile (1 kilometer) off the island's coast, forming a new volcanic outcrop named Niijima, meaning "new island" in Japanese.Satellite images from the European Space Agency on Nov. 3 revealed that Niijima is now visible from space. The newly formed landmass measures 330 feet (100 meters) across, with its highest point reaching 66 feet (20 m) above sea level. Although the October eruptions subsided, scientists warned that waves could erode ...