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[探索发现] 【整理】2010-05-23 黄石公园-3

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[Homework]【整理】2010-05-23 黄石公园-3

Rocks below the ground heat the water under pressure for around 90 minutes. Suddenly some water spurs through a tiny five-inch wide crack in the rocks.This causes a drop in the 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 bubbles start rising to the surface the system deep pressure rises and a full eruption can occur.
Old Faithful shows that rocks below the surface are very hot.Scientists find clues to a violent past 34 miles southeast of the hot springs,on the shores of a circular lake called Indian Ponds.
As a field geologist, my job is to basically be a rock detective.And so I try to determine what the origin is and what the history is of that particular rock. Here we go.OK,now, in this particular case,please look at this.This rock. We need to start it. There was just a loose...sand.You can just put your fingers through it.
The solid boarder is formed  from millions of individual grains of sand. Microscopic analysis reveals the grains have been surmounted together by chemicals and pressure deep under the ground.
But how did the rock get to the surface?
Morgan has chemically dated the rocks and discovered that 3000 years ago the boarder was blasted out of the ground by the hot water explosion of a gigantic geyser.
You would see boiling water,rock fragments and fine medy matierial being ejected up into the air as high as 3 to 5 thousand feet. And then at some point matierial would start raining down from this explosion column.Now you wouldn't wanna be standing next to one of those.
Indian Ponds is the crator that the geyser left behind.

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