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发表于 2010-8-5 00:02
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on整理稿
As continents shift and clash, volcanoeserupt, and glaciers grow and recede, the earth’s crust is carved in countlessfascinating ways, leaving a trail of geological mysteries behind.
And one of the greatest is right here, atYellowstone National Park in Wyoming. This is one of the world's mostgeologically active places, shaken by up to 5,000 earthquakesevery year, and with more geysers and hotsprings than the rest of the world combine. Why is Yellowstoneso active? How did it form? And why here, in the heart of the Rockies?Scientists studying the Yellowstone areuncovering a violent past, carved by water, crushedby ancient glaciers, and blasted by the biggest volcaniceruption ever known on the planet. And even today, Yellowstone is one of themost dangerous places on earth.
Yellowstone National Park is one of the mostamazing places on earth, and it's unique. It contains some of the America'smost stunning scenery and wildlife that attracts 3 million tourists a year. Tounderstand where the Yellowstone came from, andwhy it is so active today, we need to take a journey back into the distant pastof the North American continent and deep into the earth's interior. Yellowstone sits 8,000 feet up, on a remote mountainplateau, primarily within Wyoming, but stretching into parts of Idaho andMontana. The park covers 3,468 square miles, 63miles north to south and 54 miles east to west. And it’s on top of one of theworld's most unusual and deadliest geological structures. |
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