首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Europa’s Watery Underworld Europa, one of Jupiter’s 63 known moons, looks bright and icy on the surface. But appearances can
Europa’s Watery Underworld Europa, one of Jupiter’s 63 known moons, looks bright and icy on the surface. But appearances can
admin
2012-12-28
77
问题
Europa’s Watery Underworld
Europa, one of Jupiter’s 63 known moons, looks bright and icy on the surface. But appearances can be deceiving: Miles within its cracked, frigid shell, Europa probably hides giant pools of liquid water. Where scientists find liquid water, they hope to find life as well.
Since we can’t go diving into Europa’s depths just yet, scientists instead have to investigate the moon’s surface for clues to what lies beneath. In a new study, scientists investigated one group of strange ice patterns on Europa and concluded that the formations mark the top of an underground pool that holds as much water as the U. S. Great Lakes.
Pictures of Europa, which is slightly smaller than Earth’s moon, clearly show a tangled, icy mishmash of lines and cracks known as "chaos terrains. " These chaotic places cover more than half of Europa. For more than 10 years, scientists have wondered what causes the formations. The new study suggests that they arise from the mixing of vast underground stores of liquid water with icy material near the surface.
For scientists who suspect that Europa also may be hiding life beneath its icy surface, the news about the new lake is exciting.
"It would be great if these lakes harbored life," Britney Schmidt, a planetary scientist who worked on the study, told Science News. "But even if they didn’t, they say that Europa is doing something interesting and active right now. "
Schmidt, a scientist at the University of Texas at Austin, and her colleagues wanted to know how chaos terrains form. Since they couldn’t rocket to Europa to see for themselves, they searched for similar formations here on Earth. They studied collapsed ice shelves in Antarctica and icy caps on volcanoes in Iceland. Those features on Earth formed when liquid water mixed with ice. The scientists now suspect something similar might be happening on Europa: that as water and ice of different temperatures mingle and shift, the surface fractures. This would explain the jumbled ice sculptures.
"Fracturing catastrophically disrupts the ice in the same way that it causes ice shelves to collapse on Earth," Schmidt told Science News. She and her team found that the process could be causing chaos terrains to form quickly on Europa.
The new study suggests that on this moon, elements such as oxygen from the surface blend with the deep bodies of water. That mixture may create an environment that supports life.
The liquid water of an underground pool of Europa is estimated equivalent with that of the US Great lakes.
选项
A、Right
B、Wrong
C、Not mention
答案
A
解析
题干:欧罗巴地下水池的液态水估计相当于美国五大湖区的储存水量。从第二段最后一句可知,该题干是正确的。giant的意思是“巨大的,大量的”。故选A。
转载请注明原文地址:https://kaotiyun.com/show/OlLd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
AforyoungerandolderpeopleBtotheproperfunctionofyourmemoryCiscalledlong-termmemoryDthecapacitytostorewhat
CanAddedCalciumHelpOlderBones?NewZealandresearcherssayguidelinesadvisingseniorstoconsumeatleast1,000to1,2
CanAddedCalciumHelpOlderBones?NewZealandresearcherssayguidelinesadvisingseniorstoconsumeatleast1,000to1,2
Theweatherwassogorgeousthatmanypeoplewentouting.
AHarmScreeningMayDotoaYoungerWomanBInvestigatingtheEffectofScreeningCEffectsPredictedbyTwoDifferentMo
Manyphotographersprefertotakepicturesattwilightwhentheycantakeadvantageofthespecialeffectsofthesettingsun.
HeartbeatofAmericaNewYork—theStatueofLiberty,theskyscrapers,thebeautifulshopsonFifthAvenueandthemanytheat
Abeautifulwomanattendedtomeinthatstoreyesterday.
ForestsforCitiesYouarestandinginabeautifulforestinJapan.Theairiscleanandsmellslikeplantsandflowers.Ther
Hisstomachfelthollowwithfear.
随机试题
信誉第一
共济运动失调时可出现()
影像与实物不相似,称为
A.直接扩张血管B.阻断α1受体C.阻断钙通道D.促进K+外流E.NO供体,通过释放NO发挥作用硝普钠松弛血管平滑肌的作用机制是
某企业转让一项专利权,与此有关的资料如下:该专利权的账面余额50万元,已摊销20万元,计提资产减值准备5万元,取得转让价款28万元,应交营业税1.4万元。假设不考虑其他因素,该企业应确认的转让无形资产净收益为()万元。
黄河公司以其房屋作抵押,先后向甲银行借款100万元,乙银行借款300万元,丙银行借款500万元,并依次办理了抵押登记。后丙银行与甲银行商定交换各自抵押权的顺位,并办理了变更登记,但乙银行并不知情。因黄河公司无力偿还三家银行的到期债务,银行拍卖其房屋,仅得价
使用任务管理器可以终止程序和进程。()
Whatisthelatestproblemfacingpeoplewhodrivetoschool?
Whatjobdidthemangetfirst?Hegotthefirstjobas______.
ThepassagedepictsthedifficultyofstemcellresearchinSouthKorea.DoctorRohclaimedthatmostofthestemcelllinescr
最新回复
(
0
)