11.  Pygmy sperm whales are commonly found in warm tropical waters.

12.  The energy locked in the tropical waters is released when the warmth and moisture is drawn aloft in tall thunderstorms that swirl around the center of a hurricane.

13.  The heart of the hurricane season runs from the middle of August to the middle of October when tropical waters reach a peak in temperature.

14.  The prowess of Hawaiian chiefs was displayed through the skills of their chosen teams, which competed in the tropical waters off the islands.

15.  The warm pool of tropical water is starting to dissipate.

16.  U.S. scientists, including Sheets, began testing the theory by dropping cement powder into the upper parts of growing clouds over tropical waters.

17.  As far as scientists can tell, it is found only in tropical waters of South America.

18.  El Nino is a heating of tropical waters off the coasts of Peru and Ecuador that occurs with varying intensity every two to seven years.

19.  Flooding in East Africa has been blamed on El Nino, which occurs every few years when a major warming pattern develops in the tropical waters of the Pacific.

20.  The Atlantic Gulf Stream normally acts like a conveyor belt to deliver warm tropical water to temperate regions.