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The largest single volcano on Earth lay quietly hiding in the depths of the Pacific Ocean, about a thousand miles east of Japan, having been extinct for millions of years. Scientists have now discovered the dome-shaped behemoth, which has a footprint the size of New Mexico. The discovery topples the previous world-record holder for largest volcano — Mauna Loa, one of the five that form the Big Island of Hawaii. The area covered by the newly discovered volcano rivals the biggest volcano in the solar system, Olympus Mons on Mars.