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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 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 and up, steam bubbles start rising to the surface. The system depressurizes 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 their 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, it was just a loose sand. You can just put your fingers through it.''

The solid border is formed from millions of individual grains of sand. Microscopic analysis reveals the grains have 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 rocks and discovered that 3,000 years ago, the border was blasted out of the ground by the hot water explosion of a gigantic geyser.

''You would see boiling water, rock fragments and fine muddy material being ejected up into the air as high as 3 to 5 thousand feet. And then at some point, materials would start raining down from this explosion column. Now you wouldn't wanna be standing next to one of those.''

Indian Ponds is the crater that the geyser left behind.
Better to write for yourself and have no public, than to write for the public and have no self. 天天听力身体好
on整理稿
Rocks below ground heat the water underpressure for around 90 minutes. Suddenly, some water spurts through a tiny5-inch wide crack in the rocks. This causes a drop in the pressure within thewater chamber. In an instant, thousands of gallons of water are turned to steamand blasted up into the air.

When the pressure builds up enough,steam bubbles start rising to the surface, the system depressurizes, and then afull eruption can occur.

Old Faithful shows that rocks below thesurface are very hot. Scientists find clues to a violent path 34 milessoutheast of the hot springs, on the shores of a circular lake called Indian Ponds.

As a field geologist, my job is tobasically be a rock detective, and so I tried to determine what the origin isand what the history is of that particular rock. There we go, Ok, now, in thisparticular case, let's look at this, this rock, when it started, it was just aloose sand, you could just put your fingers through it.

The solid boulder is formed from millionsof individual grains of sand. Microscopic analysis reveals the grains have beencemented together by chemicals and pressure deep under the ground. But how didthe rock get to the surface? Morgan has chemically dated the rocks anddiscovered that, 3,000 years ago, the boulder was blasted out of the ground bythe hot water explosion of a gigantic geyser.

You would see boiling water, rock fragmentsand fine muddy material, being ejected up intothe air as high as 3 to 5,000 feet, and then at some point, material wouldstart raining down from this explosion column. Now you wouldn’t wanna bestanding next to one of those.

Indian Ponds is the crater that the geyser left behind.
Better to write for yourself and have no public, than to write for the public and have no self. 天天听力身体好
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