Located in the Back Basin of the Norris Geyser Basin, the geyser unexpectedly erupted on Feb. 7 after nearly six years of dormancy, marking its first eruption since December 2020. YELLOWSTONE NATIONAL PARK, Wyo. — Yellowstone’s Echinus Geyser—the largest acidic geyser on Earth—is putting on a show with a rare and spectacular reawakening. YELLOWSTONE EXPLOSION CAUSED BY ‘CLOGGED UP’ HYDROTHERMAL SYSTEM, SCIENTISTS SAY Located i... [1741 chars]