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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 heat the water under pressure for around 90 minutes.Suddenly some water spurts through a tiny five inch wide crack in the rocks.This causes a drop in pressure within the water chamber.In an instant,thousands of gallons of water are turned to steam and blasted up into the air.
When the pressure builds up enough,steam bubble start rising to the surface , the system depressurizes, and the full eruption can occur.Old Faithful shows that rocks below the surface are very hot.
Scientist find clue to a violent pass 34 miles south-east to the hotspring.On the shore of circular lake,called Indian ponds.
As a few geologist,my job is to basically be a rock detective.And so i try to determine what there original is and what the history is of that particular rock.
Ok,now,in this particular case,pls look at this,this rock,whey it started,it was just a loose sand.You could just put your finger through it.
The solid board ,is formed from millions of individual grans of sand.
Microscope analysis reveals the grans have been cemented together by chemicals and pressure deep under the ground.But how didi the rock get to the surface?
Morgen has chemically dated the rock since discovered 3,000 years ago.The board was blasted out to the ground by hot water explosion of gigantic geyser.you will see, boiling water,rock fragment and fine muddy material,being ejected up into the air,as high as 3000-5000 feet,and then at some point material would start raining down from this explosion column.now you wouldn't want to be standing next to one of those.Indian Ponds is the creator that the geysers left behind.
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