首页
登录
职称英语
Scientists have long sought the reasons for the relatively young age
Scientists have long sought the reasons for the relatively young age
游客
2024-01-11
34
管理
问题
Scientists have long sought the reasons for the relatively young age of the
majority of Martian meteorites discovered on Earth in comparison with the age
of Mars, an enigma exarcebated by the fact that the Martian rocks were ejected
Line by only six or seven separate impact events. Previous tests had predicted that
(5) driving meteorites to Earth would require a collision with an asteroid immense
enough to make a crater 12-kilometers across, but because such huge impacts
are extremely infrequent, it was unlikely that enough of them could have
occurred to explain our planet’s Martian meteorite collection.
Now astronomer James Head’s higher-resolution models demonstrate that
(10) collisions making craters only three kilometers across can jettison 10 million
fragments, each about 10 centimeters across, into space, a distribution
sufficient to cause some of them to be found on Earth. Sections of the planet
covered by debris (thus likely to be made up of older terrain) would require
larger and hence rarer impacts, and thus meteorites which reach Earth are
(15) predictably biased toward younger ages. [br] The passage suggests that which of the following is true concerning the probability that a given collision on Mars would eject fragments that will hit the Earth?
选项
A、The probability is higher if the impact produces a crater larger than three kilometers.
B、The probability is lower if the impact produces a crater smaller than three kilometers.
C、The probability is decreased when the impact comes from an area of Mars covered by debris.
D、The probability is decreased when the fragments produced by the impact are larger than 10 centimeters.
E、The probability is decreased when the fragments produced by the impact are younger.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3353600.html
相关试题推荐
Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinoursol
Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinoursol
Perhapsmorethananythingelse,scientistsareeagertofindoutifMartian
Perhapsmorethananythingelse,scientistsareeagertofindoutifMartian
Perhapsmorethananythingelse,scientistsareeagertofindoutifMartian
Perhapsmorethananythingelse,scientistsareeagertofindoutifMartian
Doyouhaveanyotherreasons______theonesyoujustmentionedabove?A、inadditi
Scientistssayitmaybefiveorsixyears_____thismedicineistestedonhuma
Scientistssayitmaybefiveorsixyears______thismedicineistestedonhuman
______relativelycostly,theengineishighlyefficientandneedsservicinginfr
随机试题
SincetheTitanicvanishedbeneaththefrigidwatersoftheNorthAtlantic85
合成卵磷脂时所需的活性胆碱是()A.GDP胆碱 B.TDP胆碱 C.AD
某项目设计年生产能力为80万件,年固定成本为300万元,单位产品可变成本为100
A.颊黏膜 B.舌腹黏膜 C.牙龈黏膜 D.口底黏膜 E.舌背黏膜属被覆
患者,女,72岁,患有高血压、冠状动脉粥样硬化性心脏病、高脂血症。最近1个月一直
平稳时间序列的()统计特征不会随着时间的变化而变化。 Ⅰ.数值 Ⅱ.均值
患者,21岁,1周前面部疖肿自行挤压排脓,2天前高热、寒战、头痛,伴咳嗽和少量脓
下列业务中不属于对公理财业务的是()。A:现金管理服务B:企业咨询服务C:财
居间人小王,受公司法人李某委托与期货公司订立期货经纪合同的中介服务,基于居间经纪
(2016年真题)由于不同的职业在工作保障和职业稳定程度方面存在差异而形成的工资
最新回复
(
0
)