首页
登录
职称英语
Everyone has heard of the San Andreas fault (断层), which constantly threatens
Everyone has heard of the San Andreas fault (断层), which constantly threatens
游客
2023-12-20
25
管理
问题
Everyone has heard of the San Andreas fault (断层), which constantly threatens California and the West Coast with earthquakes. But how many people know about the equally serious New Madrid fault in Missouri?
Between December of 1811 and February of 1812, three major earthquakes occurred, all centered around the town of New Madrid, Missouri, on the Mississippi River. Property damage was severe. Buildings in the area were almost destroyed.
Whole forests fell at once, and huge cracks opened in the ground, allowing smell of sulfur (硫磺) to filter upward.
The Mississippi River itself completely changed character, developing sudden rapids and whirlpools. Several times it changed its course, and once, according to some observers, it actually appeared to run backwards. Few people were killed in the New Madrid earthquakes, probably simply because few people lived in the area in 1811; but the severity of the earthquakes are shown by the fact that the shock waves rang bells in church towers in Charleston, South Carolina, on the coast. Buildings shook in New York City, and clocks were stopped in Washington, D.C.
Scientists now know that America’s two major faults are essentially different. The San Andreas is a horizontal boundary between two major land masses that are slowly moving in opposite directions. California earthquakes result when the movement of these two masses suddenly lurches (倾斜) forward.
The New Madrid fault, on the other hand, is a vertical fault; a some point, possibly hundreds of millions of years ago, rock was pushed up toward the surface, probably by volcanoes under the surface. Suddenly, the volcanoes cooled and the rock collapsed, leaving huge cracks. Even now, the rock continues to settle downwards, and sudden sinking motions trigger (触发) earthquakes in the region. The fault itself, a large crack in this layer of rock, with dozens of other cracks that split off from it, extends from northeast Arkansas through Missouri and into southern lllinois.
Scientists who have studied the New Madrid fault say there have been numerous smaller quakes in the area since 1811; these smaller quakes indicate that larger ones are probably coming, but the scientists say have no method of predicting when a large earthquake will occur. [br] As used in the first sentence of the fourth paragraph, the word "essentially" means_____.
选项
A、greatly
B、extremely
C、basically
D、necessarily
答案
C
解析
由词义可知意为“本质的”、“根本的”,故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3291003.html
相关试题推荐
[originaltext]Helloeveryone.Haveyoueverwonderedwhattheweatherislik
[originaltext]Helloeveryone.Haveyoueverwonderedwhattheweatherislik
[originaltext]MorningeveryoneandwelcometotheEnglishforAcademicPurpo
[originaltext]MorningeveryoneandwelcometotheEnglishforAcademicPurpo
[originaltext]Goodmorning,everyone.AndwelcometotheEnglishforAcadem
[originaltext]Goodmorning,everyone.AndwelcometotheEnglishforAcadem
ClimatechangethreatenssustainabledevelopmentandalleightMillenniumDe
ClimatechangethreatenssustainabledevelopmentandalleightMillenniumDe
ClimatechangethreatenssustainabledevelopmentandalleightMillenniumDe
[originaltext]QuestionNo.6Ifarobberthreatensyouathomeoronthestreet
随机试题
HeatStressThemostcommonhealthproblem【T1】______hotweatherisheat
BythetimeheleavesSchoolhisparents(spend)______$8,000onhiseducatio
A.龙胆 B.黄柏 C.苦参 D.黄连 E.黄芩治疗肺热咳嗽,首选的药物
基础设施和社会公共设施配套水平等方面的指标属于城市发展目标的()目标。A.社
四个现代化指的是工业现代化、农业现代化、国防现代化、科学技术现代化。这是1964
()年中国人民银行对银行业金融机构的监管职责移交至新设立的银行业监督管理机构。
某商业企业2020年年均职工人数215人,年均资产总额4500万元,当年经营收
克服产品生产与消费在时间上差异的物流环节是()。A.运输 B.仓储 C
以下关于外国政府贷款表述错误的是() A.项目使用外国政府贷款需要得到我
高性能的微波信道需要把空间分集和自适应均衡技术配合使用,以便最大限度地降低()
最新回复
(
0
)