Tornado
презентация к уроку по английскому языку (11 класс) на тему

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What is a tornado? Tornado - rapidly rotating column of air descending from cumulonimbus clouds or formed under less of a rain cloud, often (but not always) is seen as a funnel-shaped cloud. To be classified as a tornado, whirlwind must come out of the cloud, and to touch the ground. It is known that a tornado may form an invisible funnel.

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How do tornadoes? warm moist air from the Gulf of Mexico faces in the U.S. with cold air from Canada and dry air from the Rocky mountains. Under such conditions, a large number of storms that carry the threat of tornadoes. The most destructive and deadly tornadoes formed under a huge less of rain clouds, which in the US is called supersells

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What time of the year raises the most tornadoes? Basically the tornado season lasts from early spring to mid summer. In some States the peak tornado accounts for may, in others - on June or even July. But tornadoes can occur at any time of the year.

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What is a tornado Alley? It is the historical name of the Central American States, which has the highest number of tornadoes. However tornadoes can occur anywhere: on the West and on the East coast of the USA, and in Canada and other countries.

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Why tornadoes avoid centers of big cities? It is all probability. Just the city centre is located on a very small area compared to the area of the whole country. Therefore, the chance that a tornado will get to the center of the city, very small. For example, the area of the Central part of Dallas, just three square miles. However, the centres may suffer from a tornado. So in St. Louis tornado in the city center was observed at least four times.

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What is it like the sound of a tornado? It depends on its size, intensity, distance and other factors. Most often, the sound of a tornado compared with grohteam trains. Sometimes tornadoes produces a sound similar to the sound of the waterfall or on one that occurs when driving fast with the Windows open.

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When there was the greatest number of tornadoes in a short period of time? 3 and 4 April 1974 through 13 American States passed immediately 147 tornado and one in Canada. Killed 310 people in the United States, 8 - in Canada, 5454 man was wounded in the U.S. and 23 in Canada.

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The presentation was prepared by the student of the 11th grade: Roman Voron