填空题
Questions 36-40
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 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 'tephra' which fell on the 38 of home causing them to collapse, crushing hundreds of people.
During the eruption, large amounts of sulphur dioxide gas were emmitted, which combined with 39 to make sulphuric acid which was resposible for a great deal of ozone depletion above Antarctica.The overall effect of the cloud from this grat eruption was the lowering of 40