The Echinus Geyser had been silent for the last six years, and it is unknown whether the eruptions will continue into the summer. The world's largest acidic geyser is putting on a show again, erupting for the first time in six years after a quiet hiatus, officials at Yellowstone National Park say. The Echinus Geyser - located in the park's famous Norris Geyser Basin - had been ... [1756 chars]