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综合点评
T his sediment layer is enriched in the rare metal iridium (铱) and other elements that are relativelyabundant in a meteorite but very rare in the crust(地壳)of Earth. Even diluted(稀释) by the terrestrial(地球的)material excavated(挖掘)from the crater, this component of meteorites is ...
Scientists felt that they could get an idea of how long the extinctions took by determining how long it took to deposit this one centimeter of clay and they thought they could determine the time it took to deposit the clay by determining the amount of the element iridium (Ir) it contained...
on a single line of evidence. At locations around the globe, geologists had found an unusually high concentration of iridium in the layer of sedimentary rocks that was formed about 65 million years ago. Iridium is an element that is usually uncommon near Earth’s surface, but it is abundant...
Scientists felt that they could get an idea of how long the extinctions took by determining how long it took to deposit this one centimeter of clay and they thought they could determine the time it took to deposit the clay by determining the amount of the element iridium (Ir) it contained...
Or the whole genre of grindcore, predicated on the principle of compressing what could conceivably be a six-minute song if it were performed by, say, Suffocation, into a denser-than-Iridium thirty seconds? OK, these are valid points, but not the right points. Metal over-the-topness is ...
One interesting test of the Alvarez hypothesis is based on the presence of the rare-earth element iridium (Ir). 问题 句子分析(俗称“长难句分析”)是训练提高基础阅读能力的有效手段。我们通过对托福(TOEFL)、雅思(IELTS)、GRE、考研以及四六级等考试中真实出现过的句子(如真题、TPO,剑桥系列)进行结构化分...
clay.Scientists felt that they could get an idea of how long the extinctions took by determining how long it took to deposit this one centimeter of clay and they thought they could determine the time it took to deposit the clay by determining the amount of the element iridium (Ir) it ...