An earthquake is a shaking of the ground【小题1】(cause) by the sudden breaking and shifting of large sections of Earth's rocky outer shell. Earthquakes are among the most【小题2】(power) events on earth, and their results can be terrifying. Rock movements during an earthquake can make rivers 【小题3】(change) their course. Earthquakes can cause great damage and loss of【小题4】(live). Large earthquakes beneath the ocean can create a series 【小题5】huge and destructive waves called tsunamis 【小题6】flood coasts for many miles. Earthquakes almost never kill people 【小题7】(direct). Instead, many deaths and injuries in earthquakes result from 【小题8】(fall) objects and the collapse（倒塌）of buildings, bridges, and other structures. Fire caused from broken gas or power lines is another major danger during 【小题9】quake. Spills（溢出）of 【小题10】(harm) chemicals are also a concern during an earthquake.