職稱英語的考試輔導(dǎo)
Hurricanes
Did you know that before 1950, hurricanes had no names? They were simply given numbers. The first names were simply Alpha, Bravo, Charlie, etc. but in 1953, females names were given because of the unpredictability factor of the storms. In 1979, realizing the sexist nature of such names, the lists were expanded to include both men and women.
Hurricanes and typhoons are the same things. If they form in the Atlantic, we call these strong storms hurricanes, from the West Indian word hurricane, meaning big wind. And if they are Pacific storms, they are called typhoons from the Chinese taifun, meaning great wind. To be classified as a hurricane, the storm must have maximum winds of at least 75 mph. These storms are big, many hundreds of miles in diameter.
Hurricanes get their power from water vapor as it gives out its stored-up energy. All water vapor gives out heat as it condenses from a gaseous state to a liquid state over fixed points on the equator . To make a hurricane, you must have extremely wet, warm air, the kind of air that can only be found in tropical region.
Scientists have determined that the heat given out in the process of water condensation can be as high as 95 billion kilowatts per hour. In just one day alone, the storm can produce more energy than many industrialized nations need in an entire year! The problem is that we dont know how to make sure such great energy work for us.
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