El Nino

     1. El Nino is warming of the Pacific Ocean between South America and the Data Line.
     2. It accompanies high air surface pressure in the western Pacific.
3. El Nino occurs when tropical Pacific ocean trade winds die out and ocean temperatures become usually worm.



La-Nina
1. La Nina exists when cooler than usual ocean temperatures occur on the equator between South America and the Data Line.
2.   It accompanies low air surface pressure in the Eastern Pacific.
3.   La Nina, which occurs when the trade winds blow unusually hard and the sea temperature becomes colder than normal.

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