Volcanic eruption has been a constant threat to our natural environment for millions of years, butseldom in recent times 22.1.................... a volcano erupted with the ferocity of Krakatoa. Krakatoa, which is a volcanic island group in Indonesia, erupted on 27th August 1883. 22.2.................... only was the explosion 22.3.................... loud that it was heard as far away (more than 3000 km) as Perth in Australia, but it is also recognised as being the loudest sound 22.4.................... recorded. Tens of thousands of people in the region were killed, many 22.5.................... in the enormous tsunamis which the eruption produced - tsunamis which eventually reached South Africa and the English Channel. The explosion also had a major effect on the entire world's weather system. The volcanic dust in the atmosphere reduced the 22.6.................... of sunlight reaching the earth's surface, reducing global temperatures by more than one degree centigrade. Only after five years had passed 22.7.................... global temperature begin to return to normal Cần giải thích nữa ạ