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
2025-01-09
38
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] The New Madrid fault is_____.
选项
A、a horizontal fault
B、a vertical fault
C、a more serious fault than the San Andreas fault
D、responsible for forming the Mississippi River
答案
B
解析
第五段第一句即讲明了其为垂直断层。故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3905560.html
相关试题推荐
【1】[br]【9】[originaltext]Morning,everyone.Todaywearegoingtotalkabo
【1】[br]【8】[originaltext]Morning,everyone.Todaywearegoingtotalkabo
【1】[br]【6】[originaltext]Morning,everyone.Todaywearegoingtotalkabo
【1】[br]【5】[originaltext]Morning,everyone.Todaywearegoingtotalkabo
【1】[br]【3】[originaltext]Morning,everyone.Todaywearegoingtotalkabo
【1】[br]【2】[originaltext]Morning,everyone.Todaywearegoingtotalkabo
What’sMissPattyChing’sproblem?[br][originaltext]Denis:Hello,everyone.W
What’sMissPattyChing’sproblem?[originaltext]Denis:Hello,everyone.Welcome
[originaltext]Hi,everyone.Welcometothischatsessionaboutgambling.O
[originaltext]Hi,everyone.Welcometothischatsessionaboutgambling.O
随机试题
InthispartoftheListeningTestyoulistentoalongconversationorintervie
Oneofthemostfascinatingfieldsofpsychologyismemory.Thispassageisg
达到amountto;reach;standat
[originaltext]I:Goodmorning,listeners.TodayweareveryhappytoinvitePro
Wouldyouknowhowtohelp?Everyyear,thousandsofdriversandpasseng
WhichAttributesofaFoodProductareMostImportanttoConsumersA)Th
根据《宗教事务条例》,涉及宗教的出版物不能载有( )等内容。A.破坏信教公民与
下列关于三相正弦交流的描述正确的是()。A.线圈在磁场中旋转时,导线切割磁力线
共用题干 TrafficJams-NoEndinSight1Traf
自然规律和社会规律的不同点有 A.自然规律是由客观物质力量决定的,社会规律是由
最新回复
(
0
)