Ivan Seeking
Oct9-03, 05:37 PM
In a few days in July, acidic ground water dissolved parts of the unpaved trails in the Norris Geyser Basin, and the ground temperature of the trails shot up to 200 degrees from the usual maximum of 80. Park officials closed nearly half of the basin's trails, and they remain shut....
Over last 630,000 years, Yellowstone has experienced 29 eruptions the size of the one on Mount Pinatubo in the Philippines in 1991. The average interval here has been 20,000 years, and 70,000 have passed since its last eruption.
http://www.nytimes.com/2003/10/07/science/07GEYS.html?ei=1&en=6bfbb4f20999c1a1&ex=1066541288&adxnnl=1&adxnnlx=1065735174-kf2xiTYPKqSP09E/Iz58iA
Over last 630,000 years, Yellowstone has experienced 29 eruptions the size of the one on Mount Pinatubo in the Philippines in 1991. The average interval here has been 20,000 years, and 70,000 have passed since its last eruption.
http://www.nytimes.com/2003/10/07/science/07GEYS.html?ei=1&en=6bfbb4f20999c1a1&ex=1066541288&adxnnl=1&adxnnlx=1065735174-kf2xiTYPKqSP09E/Iz58iA