El Nino class response

Do you remember Hurricane Katrina? Well it was caused by a weather patter called El Nino, which occurs once every three to seven years. Usually, easterly tradewinds blew warm waters toward Indonesia and Austrailia. But, when the tradewinds stop blowing, the warm water floods Peru and the West coast, and Indonesia and Austrailia get droughts. This is called El Nino. this effects the fishing industry because the fish follows the cooler water because the cold water has more nutrients. Also, we learned that density plays a big role in weather patterns. Because cold water is denser than hot water, cold water stays at the bottom of the ocean.