Which of the following change in sea surface temperature best describes an el nino event?
waters in the eastern pacific steadily get warmer
waters in the eastern pacific steadily get cooler
waters in the eastern pacific show no change in temperature
waters in the eastern pacific fluctuate daily in temperature

Waters in the eastern Pacific steadily gets warmer

El Nino is caused by the periodic shift in wind speed and direction in the tropical eastern Pacific which leads to changes in sea Surface temperatures. 

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: