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
48
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
Therewasanoisy_____atthebackofthehallwhenthespeakerbeganhisaddress
[originaltext]M:Goodmorning,Ms.Smith.Welcometotoday’sshow.W:Thankyo
溶菌酶在催化反应时,下列因素中除哪个外,均与酶的高效率有关?( )A.底物形变
“物联网”是指通过装置在物体上的各种信息传感设备,如RFID装置、红外感应器、全
经济法律关系的主体中,可以签订建设工程合同的,一般只能是( )。A.公民 B
对个人、家庭和社区健康档案中的各种文字资料进行记录、查询和检索的计算机信息化管理
商业银行的监督系统由股东大会选举产生的()组成。A.监事会 B.稽核部 C
大部分计算机病毒都设定了发作条件.比如“欢乐时光”病毒的发作条件是“月+日=13
第四方物流的特点包括( )。 A.提供一整套完善的供应链解决方案 B
属性数据输入计算机的方法和非GIS的信息系统没有差异,一般是( )。A.扫描输
最新回复
(
0
)