Hawaii’s Mauna Loa is the largest active volcano on Earth. It towers nearly 10,000 feet above the much smaller Kilauea Volcano. Mauna Loa is nearly one million years old and lava has been actively pouring from its crater during the last 10,000 years. This volcano doesn’t erupt as frequently as Kilauea, but its 33 historical eruptions have, on average, generated much larger volumes of lava. Mauna Loa’s lava tends to travel fast and far, making eruption warnings essential for those living around its slopes. Photo: J.D. Griggs/USGS
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