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IV: Read the following passage and do the exercises below.
What causes earthquakes? The earth is formed of layers. The surface of the
earth, about 100 kilometers thick, is made of larger pieces. When they move
against each other, an earthquake happens. A large movement causes a violent
earthquake, but a small movement causes a mild one.
Earthquakes last only a few seconds. The rolling movements are called seismic
waves. The seismic waves start in one place, called epicenter, and roll outward.
A seismic wave travels around the earth in about twenty minutes. Usually, an
earthquake is strong enough to cause damage only near its epicenter.
After an earthquake happens, people can die from lack of food, water, and
medical supplies. The amount of destruction caused by an earthquake depends
on where it happens, what time it happens, and how strong it is. It also depends
on types of buildings, soil conditions, and population. Of the 6000 earthquakes
in the world each year, only about fifteen cause great damage and many deaths.
If seismologist could predict earthquakes, we could save about 20,000
human lives each year. Human can control many things about nature, but we
cannot control earthquakes.
A. T/F sentences.
1.
2
3.
4.
Today scientists know something about the causes of earthquakes
Most of the world's earthquakes are too small to cause
serious damage.
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CONTATTAC
AT
Earthquakes happened everywhere in the world.
People can predict earthquakes and control them.