填空题Answer the questions below. Write NO MORE THAN THREE WORDS AND/OR A NUMBER for each answer.
When did Mt. Pinatubo erupt for the first time?
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When was the earthquake measuring 7.8 recorded?
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When did the experts begin to study Mt. Pinatubo?
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What fell on the local villages on 2nd April?
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What does a "Level 5" alert mean?
填空题Complete the summary below. Write NO MORE THAN THREE WORDS for each answer.
Several large earthquakes were triggered by the eruption of Pinatubo on 15th June 1991 because of the
____6____
of the summit. The "caldera" thus created considerably reduced the height of the mountain. At the same time a
____7____
was passing by and the rain associated with it mixed with the cinders in the air to form a substance called "tephra" which fell on the
____8____
of homes causing them to collapse, crushing hundreds of people.
During the eruption, large amounts of sulphur dioxide gas were emitted, which combined with
____9____
to make sulphuric 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
____10____
.