The New Madrid fault,on the other hand,is a vertical fault;at 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 cause 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 Illinois.
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 they have no method of predicting when a large earthquake will occur.
1.This passage is mainly about
.
A.the New Madrid fault B.the San Andreas
C.the causes of faults D.current scientific knowledge about faults
2.Which of the following pictures best describes the type of the New Madrid fault?
3.This passage implies that
.
A.horizontal faults are more dangerous than vertical faults
B.vertical faults are more dangerous than horizontal faults
C.a lot of people would die if the 1811 New Madrid earthquakes happened today
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