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This investigation is part of the NASA: Mission Geography Module "What are the causes and consequences of climate change?" that guides students through explorations in climatic variability and evidence for global climate change. 

El Niño is a condition that sometimes occurs in the Pacific Ocean, but it is so big that it affects weather all over the world.  Weather depends a lot on ocean temperatures. Where the ocean is warm, more clouds form, and more rain falls in that part of the world.

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