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[探索发现] 【整理】2010-05-23 黄石公园-3

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Rocks below ground hit the water under pressure for around 90 minutes .Suddenly some water spurts through a tiny 5-inch wide crack in the rocks .This causes a drop in the pressure within water chamber .In an instant ,thousands of gallons of water are turned
into steam and blasted up into the air .

“When the pressure builds it up enough ,steam bubble starts rising in the surface .The system’s deep pressure rises and the full eruption can occur .”
Old faithful shows that the rocks blow the surface are very hot .Scientists find clues to a violent path 34 miles southeast of the hot springs on the shores of circular lake called Indian ponds .
“This is field geologist .My job is basically to be a rock detective .And so I try to determine what the origin is ,and what the history is ,that particular rock .Okay ,in this particular case ,let’s look at this ,this rock ,we need to start it ,it was just loose sand .You can just put your finger through it .
The solid bouder is formed from millions of individuals grains and sand .Microscope analysis reviews the grain had been cemented together by chemicals and pressure deep under the ground .But how did the rock get to the surface .Morgan has chemically dated the rock and discovered three thousand years ago the bouder was blasted out of the ground by the hot water explosion of the gigantic geyser .
“You will see boiling water ,rock fragments ,fine muddy material .being ejected open to the air as high as three to two thousand feet .And to some point ,materials would start raining down from the explosion column . Now you wouldn’t wanna be standing next one to those .Indian pond is the creator of the geyser left behind .
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