Read the passage and choose the best answers to the questions below.(10 pts)

Tsunami is a Japanese word which means harbour waveand is used as the scientific term for seismic sea wave generated by an undersea earthquake or possibly an undersea landslide or volcanic eruption. When the ocean floor is tilted or offset during an earthquake, a set of waves is created similar to the concentric waves generated by an object dropped into the water. Most tsunamis originate along the Ring of Fire, a zone of volcanoes and seismic activity, 32.500 kilometres long that encircles the Pacific Ocean. Since 1819, about 40 tsunamis have struck the Hawaiian Islands.

A tsunami can have wavelengths, or widths, of 100 to 200 km, and may travel hundreds of kilometres across the deep ocean, reaching speeds of about 725 to 800 kilometres an hour. Upon entering shallow coastal waters, the wave, which may have been only about half a metre high out at sea,suddenly grows rapidly. When the wave reaches the shore, it may be 15 m high or more. Tsunamis have tremendous energy because of the great volume of water affected. They are capable of obliterating coastal settlements.

Tsunamis should not be confused with storm surges, which are domes of water that rise underneath hurricanes or cyclones and cause extensive coastal flooding when the storms reach land. Storm surges are particularly devastating if they occur at high tide. A cyclone and accompanying storm surge killed an estimated 500.000 people in Bangladesh in 1970. The tsunami which struck south and southeast Asia in late 2004 killed over 200 thousand people.

71.Scientifically, tsunami is the term for _______.

A. seismic sea wave.                                                B. undersea earthquake.    

C. undersea landslide.                                             D.volcanic eruption.

72.What does the word “concentric” mean?

A.Wavy                                                                      B.Having many centres                  

C.Having a common centre                                    D.A ring

73.Which of the following may be a reason for a tsunami?

A.An inactive volcano.                                           B.A landslide on the seashore.
C.An undersea earthquake.                                   D.A storm.     

74.What will happen when an object is dropped into the water?

A.Volcanic eruption may be a consequence.       B.Some concentric waves will be generated.
C.There will be seismic activity.                            D. Earthquake may happen.

75. What is the zone of volcanoes and seismic activity in the world called?

A.The concentric wave.                                          B.The tsunami.
C.The Pacific Ocean.                                               D.The Ring of Fire.

76. What is the greatest speed of tsunamis travelling across the deep ocean?

A.200 kilometres an hour.                                      B.700 kilometres an hour.

C. 800 kilometres an hour.                                     D.150.000 kilometres an hour.

77. How high is the wave of the tsunami when it reaches the shore?

A.100 metres.            B.200 metres.                        C.Half a metre.          D.Fifteen metres.
78. How are tsunamis capable of obliterating coastal settlements?

A.They have tremendous energy due to the great volume of water affected.

B.They are a metre high or more.                          

C.They travel hundreds of kilometres.

D.They can strike the shore fifteen metres high.
79.What killed an estimated 500.000 people in Bangladesh?

A.A tsunami.                                                 B.A cyclone and accompanying storm surge.

C.A high tide.                                                D.Flooding.

80.Which of the following is NOT true?

A.Tsunamis only occur in Asia.                

B.A cyclone along with storm surge happened in Asia in 1970.

C.Storm surges are domes of water rising underneath hurricanes or cyclones.

D. Storm surges cause extensive coastal flooding.