in central and south america/many countries have a rainy season and a dry season/however,every few years,the seasons are much rainier or drier than normal/Sometimes there are terrifying floods,and at other times there are droughts that kill plants and animals/These extreme weather events are caused by tiny changes in the temperatuer of the Pacific Ocean,sometimes by a little as one half of a degree.When the ocan gets warmer then usual,the phenomenon is called