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
52
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:http://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
Obama’sremarkswerehismost______descriptionofhowhispersonalreligiousbel
[originaltext]M:AndnowhereisourguestJaneThomastotellusabout(1)the
TheImportanceofQuestionsFornon-nativespeakerso
[originaltext]Controllingtrafficisacomplexandhighcostprobleminman
()是指企业取得政府作为企业所有者投入的具有专项或特定用途的款项。A.政府
??依照《医疗机构制剂配制质量管理规范(试行)》配制制剂的质量管理文件主要有A.
已知H2O2在催化剂作用下分解速率加快,其能量随反应进程的变化如图2所示。下列说
ToliveintheUnitedStatestodayisto
我国基金的年管理费率通常为基金资产净值的()。A:2.5%B:2%C:1.5
某银行员工勤奋好学,经常向另一部门其他岗位的同事学习业务知识,在同事偶尔外出时还
最新回复
(
0
)