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제목 [Kevyn Lee] listening series 1 1-3 question
Lesson 06 lecture 1-3 6
작성자 lau*** 등록일 2020-08-01 오전 2:29:39
그 uranium-lead dating lecture에서 zircon 얘기가 나올 때 교수님이 하고자 하는 말은 zircon is a material that contains radioactive uranium, and it starts off as molten magma. When it crystallize,the uranium inside the grain would change into lead. and if you measure the amount of lead, then you can figure out when it was formed. lastly, when you compare that sample with various grain in other mountains, then you would know that sample was actually came from that mountain. 아닌가요 ?? 그럼 14번 문제에서 먼저 age of the zircon을 알아야 다른 mountain ranges에 있는 grain들이랑 비교 할 수 있는 거 아닌가요 ?? 
2020-08-01 오후 5:12:04

그 질문 관련된 script 야~ 읽어보면 바로 이해 될거야~

 

Zircon starts off as molten magma, the hot lava from volcanoes. This magma then crystallizes. Andwhen Zircon crystallizes, the Uranium inside it begins to change into Lead. Soif you measure the amount of Lead in the Zircon grain, you can figure out whenthe grain was formed. After that, you can determine the age of Zircon fromdifferent mountain ranges. Once you do that, you can compare the age of theZircon in the sandstone in your sample to the age of the Zircon in themountains. If the age of the Zircon matches the age of one of the mountainranges, then it means the sandstone actually used to be part of that particularmountain range.

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