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越来越大的红海
2007-11-14 10:10:32
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    It’s said that Moses was a leader of the Jewish people in ancient times. According to the story in the Bible, he brought the Israelites(以色列人) out of Egypt. They were able to escape from the Egyptians when God helped Moses make the waters of the Red Sea move so that they could walk across.(详见《圣经 出埃及记》)
     The Red Sea is parting again. But this time Moses doesn’t have a hand in it.  (这次和摩西没什么关系)Satellite images show that the Arabian plate(板块) and the African plate are moving away from each other, stretching the earth’s crust (外壳) and widening the southern end of the Red Sea.
    Last September, a series of earthquakes started splitting (分裂) the planet’s surface along a 37-mile section of the East African Rift (裂缝) in Afar, Ethiopia. Over a period of three weeks, the crust on the sides of the rift moved apart by 26 feet.
    “We think that the crust and mantle (地幔) melt slowly at depths greater than 10 kilometers, where it is hotter, forming molten rock,” said Tim J. Wright. “This molten rock rises through the crust because it is less dense than the surrounding rock.”
    The molten rock collects in its chambers (岩腔) at depths of 3 to 5 kilometers where the density is the same as the crustal rocks, Wright explained.  “Slowly, the pressure has been building up in these chambers until last September when it finally cracked, breaking the crust. The molten rock then moved into this crack.”

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