Option 1 -> Describes the characteristic warming of equatorial Pacific waters that defines El Niño.
Option 2 -> This describes La Niña, the opposite phenomenon with abnormal cooling.
Option 3 -> El Niño actually weakens Indian monsoon rainfall, often causing drought conditions.
Option 4 -> El Niño warms the Eastern Pacific, while causing cooler and drier conditions in the Western Pacific and Indian Ocean.
Hence, Option 1 -> El Niño is a climate pattern characterized by the abnormal warming of sea surface temperatures in the equatorial Pacific Ocean, particularly in the central and eastern regions. This warming disrupts normal atmospheric circulation patterns, affecting weather worldwide, including weakening monsoons in India and Australia while bringing heavy rainfall to South America -> correct