首页
登录
职称英语
[originaltext] The ordinary raindrop is a mighty earthmover with sufficient
[originaltext] The ordinary raindrop is a mighty earthmover with sufficient
游客
2023-09-12
42
管理
问题
The ordinary raindrop is a mighty earthmover with sufficient strength to cut rock. When rainwater collects on the surface of the ground, some of it evaporates and some of it sinks into the earth. The remainder begins to flow downhill, commencing its lengthy journey from brook to stream to lake, or to a river that will carry it to the sea.
As water flows along the ground, it picks up sand, pebbles, even boulders. It uses them to gnaw at the sides and bottoms of its channel, gradually loosening more earth.
By this process enormous amounts of mud and rock are moved from the land to the sea. Each year the Mississippi River carries 730 million tons of solid matter into the Gulf of Mexico.
This constant hauling of land into the sea is lowering the United States’ average height above sea level at a rate of about one foot every 9,000 years. If erosion continues at the same rate, the United States will be worn completely down to sea level in about 23 million years.
What does erosion by water result in?
选项
A、It is being raised each year.
B、It remains constant.
C、It will reach sea level in 9,000 years.
D、It is being lowered gradually.
答案
D
解析
细节辨别题 文中讲到美国的平均海拔高度在以每9000年一英尺的速度下降。
转载请注明原文地址:https://tihaiku.com/zcyy/3008442.html
相关试题推荐
[originaltext]The22ndofNovember1970isadaythatthreeBritishsoldier
[originaltext]Amanoncesaidhowuselessitwastoputadvertisementsint
[originaltext]TheOlympicGamesoriginatedin776B.C.inOlympia,asmall
[originaltext]TheOlympicGamesoriginatedin776B.C.inOlympia,asmall
[originaltext]M:Hi,Cathy.IamherebecauseIvisitedcavesalloverNorthAm
[originaltext]M:Hi,Cathy.IamherebecauseIvisitedcavesalloverNorthAm
[originaltext]M:Excuseme,Prof.Thomson.Iknowyourofficehoursaretomorro
[originaltext]M:Excuseme,Prof.Thomson.Iknowyourofficehoursaretomorro
[originaltext]Throughtheyearsofbeinganadvisorattheuniversity,I’ve
[originaltext]Throughtheyearsofbeinganadvisorattheuniversity,I’ve
随机试题
IfWisarandomvariablethatisnormallydistributedwithameanof5andast
WriteacompositionentitledTalentShow(选秀节目).Youshouldwriteatleast150wo
多级汽轮机的优越性不包括()。A.提高单机功率,蒸汽在汽轮机中具有较大的质量
砌体工程中,下列墙体或部位中可以留设脚手眼的是( )。A.宽度≤2m,且>1m
变应性鼻炎的确诊需要A.病史 B.症状 C.鼻腔检查 D.皮肤点刺实验及或
糖原
下列各项中,不符合内部牵制的要求的是()。A、出纳人员管票据 B、出纳人员
1.在高负荷期间,应增加对断路器的巡视次数,并重点巡视()有无发热现象。
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
现金比率反映的是()。A.企业可在短期内转变为现金的流动资产偿还到期流动负债的
最新回复
(
0
)