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考了一个地幔,里面有提到铁的问题(希望没记混,昨天看前一个库的鸡精看的太多了,哭
https://www.newscientist.com/article/mg16021565-400-deep-secrets/
二段说两种解释,一种就是用温度来解释,在3700度左右,含铁的坚硬的咚咚就开始熔化。另一种是关于(有题),还考到主旨题,一个问以下关于中间层物质哪个说法是正确的
Fortunately, there are other ways to tackle the question. Researchers are exploring two scenarios. One is that a section of the lower mantle unpolluted by iron from the core melts at exactly the temperature and pressure found in that region. Recent work by mineral physicist Reinhard Boehler of the Max Planck Institute for Chemistry in Mainz, Germany, supports that view. Boehler notes that temperature estimates for the top of the core have converged in recent years on about 3700 °C. In the lab, when Boehler crushes silicon dioxide, magnesium oxide and other likely ingredients of the deep mantle, part of the mash starts to melt near that temperature. That’s consistent with a thin ULVZ, he observes, because the temperature of the mantle falls rapidly with increasing distance from the core. “It may seem a beautiful coincidence,” Boehler admits. “But it can explain the ULVZ without resorting to an exchange of molten iron and silicate at the boundary.”
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