首页
登录
职称英语
[originaltext] I’m going to pass this piece of amber around so you can see t
[originaltext] I’m going to pass this piece of amber around so you can see t
游客
2025-02-09
24
管理
问题
I’m going to pass this piece of amber around so you can see this spider trapped inside it. It’s a good example of amber-inclusion, one of the inclusions that scientists are interested in these days. This particular piece is estimated to be about 20 million years old. Please be extremely careful not to drop it. Amber shatters as easily as glass. One thing I really like about amber is its beautiful golden color.
Now, how does the spider get in there? Amber is really fossilized tree resin. Lots of chunks of amber contain insects like this one or animal parts like feathers or even plants. Here is how it happens. The resin oozes out of the tree and the spider or leaf gets in cased in it. Over millions and millions of years, the resin hardens and fossilizes into the semiprecious(次珍贵的、准宝石的) stone you see here.
Ambers can be found in many different places around the world. But the oldest deposits are right here in the United States, in Appalachia(阿巴拉契亚). It’s found in several other countries, too, though right now scientists are most interested in ambers coming from the Dominican Republic(多美尼加共和国). Because it has a great many inclusions, something like one insect inclusion for every one hundred pieces. One possible explanation for this it that the climate is tropical and a greater variety of number of insects thrive in tropics than in other places. What’s really interesting is the scientists are now able to recover DNA from these fossils and study the genetic material for important clues to revolution.
选项
A、Tropical insects.
B、Decayed leaves.
C、Tree resin.
D、Bird feathers.
答案
C
解析
What is amber derived from?
转载请注明原文地址:https://tihaiku.com/zcyy/3949203.html
相关试题推荐
[originaltext]I’mgoingtopassthispieceofamberaroundsoyoucanseet
[originaltext]I’mgoingtopassthispieceofamberaroundsoyoucanseet
[originaltext]M:DoyouwanttothemovieswithonSaturday?W:Thanks,butI
[originaltext]About200yearsago,theUnitedStateseconomywasgrowingqu
[originaltext]About200yearsago,theUnitedStateseconomywasgrowingqu
[originaltext]Today,wearegoingtocontinueourdiscussionofBuddhism.I
[originaltext]Today,wearegoingtocontinueourdiscussionofBuddhism.I
[originaltext]Today,wearegoingtocontinueourdiscussionofBuddhism.I
[originaltext]Today,wearegoingtotalkaboutaspecialwaysomeplantsr
[originaltext]M:IamsorelievedIjustfinishedthestoryIwasworkingonfo
随机试题
Chimp(黑猩猩)ShowHallmarkofHumanCulture,StudyFindsResearcher
WhichofthefollowingstatementsisNOTtrueaboutthesurvey?[originaltext]
已知函数f( )、g( )的定义如下所示,执行表达式“x=f(5)”的运算时
根据《侵权责任法》规定,饲养的动物造成他人损害的,动物饲养人或者管理人应当承担侵
卡托普利(巯甲丙脯酸)的降压作用机制是A.抑制肾素的合成 B.抑制肾素的释放
有位历史老师,在讲授“盛唐气象”一课时,采用了自主、合作、探究的教学模式,具体实
A.血尿 B.蛋白尿 C.血红蛋白尿 D.胆红素尿 E.乳糜尿阻塞性黄疸
A.生物制品 B.乙类非处方药 C.专有标识 D.处方药 E.化学药品以
1894年7月丰岛海战后,中,日相互宣战。1895年2月,北洋海军全军覆没,中日
痰色白清稀而多泡沫者为A.风痰 B.寒痰 C.热痰 D.湿痰
最新回复
(
0
)