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  3. Several large earthquakes were triggered by the eruption of Pinatubo on 15th June 1991 because of the (36) of the summit. The

Several large earthquakes were triggered by the eruption of Pinatubo on 15th June 1991 because of the (36) of the summit. The

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问题     Several large earthquakes were triggered by the eruption of Pinatubo on 15th June 1991 because of the  (36)   of the summit. The ’caldera’ thus created considerably reduced the height of the mountain. At the same time a  (37)   was passing by and the rain associated with it mixed with the cinders in the air to form a substance called ’ tapir’ which fell on the  (38)   of homes causing them to collapse, crushing hundreds of people.
    During the eruption, large amounts of sculpture dioxide gas were emitted, which combined with  (39)   to make euphoric acid which was responsible for a great deal of ozone depletion above Antarctica. The overall effect of the cloud from this great eruption was the lowering of  (40)  .
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