Although most people understandably think of volcanic eruptions as coming from a volcano, all four of the most recent eruptions have actually been fissure-style: when lava forces its way out of Earth’s crust through a newly formed thin crevasse, often at location that cannot be identified prior to the paroxysm. Unpredictable fissure eruptions happen around the world, including on Hawai‘i, but they aren’t as well known.