What Makes An Old Geyser Faithful?
Saturday, June 14, 2008 - 08:28
in Earth & Climate
New research suggests that how often Old Faithful and other Yellowstone geysers erupt may depend on annual rainfall patterns. Geysers are rare hot springs that periodically erupt bursts of steam and hot water. Old Faithful has remained faithful for at least the past 135 years, showering appreciative tourists every 50 to 90 minutes (most recently an average of 91 minutes).