首页
登录
职称英语
What accounts for the low-lying, flat surface of Mars’s north? On Earth’s su
What accounts for the low-lying, flat surface of Mars’s north? On Earth’s su
游客
2024-01-10
17
管理
问题
What accounts for the low-lying, flat surface of Mars’s north? On Earth’s surface, higher- and lower-lying areas have different types of crust: one, thin and dense, is pulled toward Earth’s center more strongly by gravity, and the planet’s water naturally comes to sit over it, creating oceans. The processes that generate this oceanic crust drive plate tectonics.
Is Mars’s north similarly characterized by a sort of crust different from other areas of the planet? Some researchers do see signs of tectonic activity surrounding the northern basin that suggest that it was created through the formation of new crust, like ocean basins on Earth. However, McGill points to northern bedrock structures that predate the features said to mark the start of the tectonic process. McGill instead believes that through some novel mechanism the ancient surface sank to its current depth as a single unit. This would explain why features around the basin’s edge, which would have formed as the surface dropped, seem to be younger than structures at its floor.
The third possibility is that the northern lowlands result from impacts. Some researchers suggest they formed as a series of big overlapping impact craters. Others arguing that the odds against such a pattern of impacts are large, postulate a single event—the impact of an object bigger than any asteroid the solar system now contains. [br] Which of the following can be inferred from the passage about geological features on Earth?
选项
A、The relative elevation of the lowest-lying regions of the crust arises in part from forces generated within the planet.
B、The difference in elevation between the ocean basins and their surroundings is greater than the difference between Mars’s northern basin and its surroundings.
C、The formation of low-lying areas proceeds by a different process than the one that created Mars’s northern basin.
D、The weight of the oceans does not affect the depth of the ocean basins.
E、The proportion of the crust that is oceanic crust is increasing.
答案
A
解析
“相对海拔”可以是正数,也可以是负数。文中盆地的相对海拔是负数,“行星内部的力量”对应地球引力。B项文中未提及。C项文中未提及。D项文中未提及。E项文中未提及。
转载请注明原文地址:https://tihaiku.com/zcyy/3349664.html
相关试题推荐
Scientistsbelievethatbyraisingatmosphericpressureandsurfacetemperature,
Whenhomeisapproximately2,000feetunderthesurfaceofthesea,itischalle
Thegapsinexistingaccountsoftheplaywrightslifearenot(i)______,sincemu
Forcenturies,sailorshavereportedseeingthesurfaceoftheoceanglowingwit
Representingaroundworldonaflatsurfaceisimpossiblewithoutsome______:t
Whataccountsforthelow-lying,flatsurfaceofMars’snorth?OnEarth’ssu
Whataccountsforthelow-lying,flatsurfaceofMars’snorth?OnEarth’ssu
Climatologistsobservedin1964thataslowwarmingofthesurfaceoftheNo
ThesurfaceofVenuscontainscalcite,amineralthatabsorbsthegassulfur
Istourismboominginyourcountry?Whatdoyouthinkaccountsforitsbooming?
随机试题
Almosteverynewinnovationgoesthroughthreephases.When【C1】______introduced
DearSir,Muchtomyregret,Iwritethislettertocomplainaboutyourbad
(2011年)2019年6月国内某手表生产企业进口手表机芯6000只,海关审定的
髂内动脉前干分支不直接供血的是A.卵巢 B.子宫 C.输卵管 D.阴道
以下各项中,不属于得气感觉或反应的是()A.针刺部位有酸胀、麻重感
静态无功补偿装置安装完成后,应对所有连接铜排进行紧固性检查,防止出现松动引起接触
牛角∶梳子A:钢板∶矿石 B:玉米∶汽油 C:空气∶氧气 D:
发行涉及国有股的,应在国有股股东之后标注(),在国有法人股股东之后标注(),
以下选项中,属于商业银行对于市场风险加权资产的计算方法的是()。A:内部评级法
下列关于预防性控制和检查性控制的说法中,错误的是( )。A.预防性控制通常用于正
最新回复
(
0
)