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  3. Tornadoes A tornado is a violently turning tube of air suspended from a thick cloud. / It extends from a thunderstorm in the

Tornadoes A tornado is a violently turning tube of air suspended from a thick cloud. / It extends from a thunderstorm in the

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答案 Tornadoes A tornado is a violently turning tube of air suspended from a thick cloud. / It extends from a thunderstorm in the sky down to the ground. / The shape is like a funnel: / wide at the top, narrower at the bottom. / Tornadoes form when winds blowing in different directions / meet in the clouds and begin to turn in circles. / Warm air rising from below causes the wind tube to reach toward the ground. / Because of their circular movement, / these windstorms are also known as twisters. / The most severe tornadoes can reach wind speeds of 320 kilometers an hour or more. / Weather experts can identify the conditions to form a tornado. / And when they observe them, / they can advise people that tornadoes might develop. / But they are not able to tell exactly where or when a tornado will hit. / Tornado warnings still depend in large part on human observations. /
解析     龙卷风
   龙卷风是在雷暴中自厚云层悬挂而下直至地面的一种呈漏斗柱状的强风旋涡。两股空气强烈相向对流运动，相互摩擦形成空气旋涡，空气绕龙卷风的轴快速旋转，四面八方的气流被吸入涡旋的底部，并随即变为绕轴心向上的涡流。其最高速度达到每小时320千米。
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