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Show Many ppysera in the basin of the Fire Hole rh cr, the greatest geyser , area in the world, have ceased shooting shoot-ing entirely within the last GO yars, j while others which Were formerly in ! active are uirain shooting, j Old Kaiiht'ul still sends steam and j water in.o the air to a height of loU ! to -00 feet and is surrounded day an; ! niht by throngs of tourists a waiting f his outhi;is;s. "Old Faithfd" Geyser j Alters Eruption Period j Yellowstone National Park. Even j Old Faithful, supposed to be the most constant, and tertaiuly the most cele- j brated geyser In the world, is under- ! going changes. I This year. Old Faithful Is erupting every 67 minutes and his outbursts last for about live minutes. In the memory of living scientists, this geyser , became active every 00 minutes, and : there Is much speculation as to changes beneath tlie earth's surface which are slowing down this old w. n-rfer. |