I. Fill the gaps with the correct prepositions. A study of

I. Fill the gaps with the correct prepositions. A study of ancient coral reefs has evealed that the weather phenomenon known the..........(1) El Nino was most intense during the 20century. El Nino, which has been present .......... (2) the past 130,000 years, is an atmospheric phenomenon occurring in the Pacific Ocean. It
is known to contribute .......... (3) climatic disturbances along the western coast of Peru and Ecuador .......... (4) account of exceptionally warm ocean conditions it brings .......... (5). El Nino, which stands .......... (6) the child' referring .......... (7) the infant Jesus Christ, appears in the regions every December around Christmas. Every three to seven years, El Nino brings .......... (8) being really severe and intense weather conditions. The disturbances strike when the warm ocean currents result .......... (9) a reversal in the normal weather conditions of the eastern and western Pacific. El Nino is responsible .......... (10) changes in the wind pattern, temperature of the air and the sea surface, which .......... (11) turn culminate
.......... (12) heavy rainfalls in South America as well .......... (13) droughts in India and southern Africa. It is now said that El Nino can influence the climate of more than half the earth. It is also blamed .......... (14) recent droughts and floods in Australia. Researchers claim that El Nino's activity was never .......... (15) acute as during the last hundred years. Its intensity has been .......... (16) the increase since ice ages. The popular view is that El Nino's intense impact may berelated .......... (17) global arming and emissions of greenhouse gases. Although there is no suf ficient vidence to back .......... (18) the assumption, it is common knowledge that a great many global changes have come .......... (19) in climate ever .......... (20) the temperature on the planet started to increase.
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