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[探索发现] 【整理】2010-05-23 黄石公园-3

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Hot rocks below ground  heat water under pressure for around ninety mintues. Suddenly some water spurt through a tiny **  crack in the rocks. This causes a drops in pressure within water chamber.  In an instant, thousands of gallons of water are turned to steam and blasted up into the air.

"When the pressure build up, steam***** surfurace, the  system ****", eruption can occur."

Old faithful shows the rocks below the surface are very hot. Sceintist find clues to a violent path thirty-four milles south-east hot spring on the shore the circular lake called indian pund.

"it is few geologist. my job is basically to be a rock detective. so i try to determine what the origin is, and what the histroy is of this particular rock. Ok, now in this particular case, look at this,  this rock, we need to start it, we just,  loose sands. You just can put your fingure through it. "

The solid boulder is formed from milions of individual grains of sands.  Microscope anaylizes reveals that grain have been cemented together by chemical and pressure deep under the ground. But how did the rock get to the surface?  More and chemical data show  three thousands years ago,  the boulder were blasted out to the ground by the hot water explosurion of gigantic geyser.

you will see the boiled water, rock fragement, and fine muddy materials been injected open to the air as high as three to five thousands feets.  and then some points,   materials started runing down from this explosure colum. Now you wouldnot want to be standing next to one of those.      

Indian pumces is the crater, the geyer left behind.
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