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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 ground,heat the water under presure for around ninty minutes.Suddenly some watersprouts through a tiny five inch wide crack in the rocks.This causes a dropping in the presure within the water chanber.In an instant,thousands of gallons of water are turned to steam and blasted up into the air.
When the presure builds up enough,steam bubbles started rising to the surface,the system * ,and then for an eruption can occur.
Bob * shows that rocks below the surface are very hot.
Scientists find clues to a violent path thrity-four 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 rocket detective.and so i tried to determine where the origin is and what the history is of that particular rock.There we go.Ok now,in this particular case,let's look at this.This rock,when it started,this was just the loose sand.You can just put your fingers to it.
The solid boulder is formed from millions of individual germs of sand.Microscopical analysis reveals the grains have been surmented together by chemicals and presure deep under the ground.But how did the rock get to the surface?Mogan has chemically dated the rocks and discovered thatthree thounsand years ago.The boulder was blasted out of the ground by the hot water explosion of gigantic geyser.
you will see,boiling water,rock fragments,and fine muddy material being ejected up into the air as high as three to five thiusand feet.And then at some point ,material would start rainning down from this explosion column.Now you would't want to be standing next to one of those.
Indain Ponds is the creator that the gyeser left behiand



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