technique called uranium-lead dating. 选项分析: 文章开头讲到dating technique,又说it's foundamental。接着说了我们对Grand Canyon旧有的认知,然后转折说现在发现了一些令人惊讶的difference,然后引出,uranium-lead dating,并且之后的文本也都在说这种技术。因此答案选B。
Definition Uranium – lead dating is the geological age-determination method that uses the radioactive decay of uranium (U) isotopes ( 238 U, 235 U, and also in this entry 232 Th) into stable isotopes of lead (Pb) ( 206 Pb, 207 Pb, and 208 Pb, respectively). U–Pb geochronology is...
If the age of the Zircon matches the age of one of the mountain ranges, then it means the sandstone actually used to be part of that particular mountain range. 24. 25.Good. So, in this case, Uranium-Lead Dating was used to establish that half of the sandstone in the samples was form...
code dating 代码日期标注 geologic dating 地质年代测定 helium dating 氦年代测定法 相似单词 dating n. 1.测定年龄[年代] uranium n. 铀 lead v.[T] 1.(走在前面)(给…)带路;(为…)开路;引导;带领 2.为(某人)带[引]路;引领(人);牵引(动物) 3.(尤指政党)领导,率领,带领 4.引导(谈话或...
uranium-lead dating has produced some surprises.Two geologists discovered that about half of the sand from the Grand Canyon was actually once part of the Appalachian Mountains.That's really eye-opening news, since the Appalachian Mountain range is, of course, thousands of kilometers to the east...
uranium.中文: 自然资源:煤、金、钨、铅、铜、铀。英文: Travel or Internet dating will lead to love.中文: 水瓶座:旅行或者网上约会都能带来爱情。英文: Toxic effects of uranium and lead to B. subtilis中文: 铀和铅对枯草杆菌毒性的研究
托福 托福01 - Uranium-Lead Dating 错误反馈材料音频 去精听 查看全文 题目L2 1 2 3 4 5 6What does the professor mainly discuss? A . The difference in age among American mountain ranges B . The importance of a technique used for dating geological materials C . The recent discovery of...
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