This paper cited 1956 Shanghai tornado and 1925 American tornado. Is the effect exactly the same? Why?

① In midsummer, when listening to the typhoon weather forecast, you can often hear the words "the wind force at the typhoon center is above 12". It seems that "12" is the best wind. Is there a stronger wind in nature? Yes, it was a tornado.

(2) Tornadoes are commonly known as "dragons suck water", probably because the shape of their funnel-shaped cloud columns is very similar to the shape of the mythical "dragons" falling from the sky and sucking water into the air. In fact, it is a strong wind vortex with small range and strong wind force extending from the bottom of thunderstorm cloud to the ground or water surface.

(3) Tornadoes are extremely strong. Near the tornado center, the horizontal wind speed can reach more than 100 meters per second, and in extreme cases it can reach 300 meters. 12 wind speed is equivalent to more than 30 meters per second, which is naturally not as good as a tornado. The damage caused by such a rare huge wind force is amazing. When it touches the ground, it can throw people and animals into the air like a joke, and then throw them down. It can "pull up weeping willows", destroy buildings and even cut off a corner of a solid tall building like a sword. On September 24th, 1956, a tornado appeared in Shanghai. It actually lifted a three-or four-story 1 10 ton oil storage tank into the air of 15 meters, and then threw it away from 100 meters. During 1925, a powerful tornado occurred in the United States, causing more than 2,000 casualties. Why is the tornado so strong? The main reason is that a large amount of air escapes in the tornado, which makes the air in the center of the tornado very thin and the air pressure is very low, which is particularly different from the air pressure in the periphery. The air difference between the typhoon center and the periphery is 20 millibars per 100 km on average, while the air difference between the tornado center and the periphery is 20 millibars as long as it is 20 meters. The greater the pressure gradient, the greater the wind force. No wonder tornadoes are many times stronger than typhoons.

(4) The area covered by tornado is very small. 1927 A tornado in North Carolina, USA, in which trees were uprooted within 15 square meters, is safe near the tornado.

1, the interpretation structure of the third paragraph is

A: Causality B: Total score C: Total score

2. Point out the explanation method of the third paragraph and give examples.

①

②

③

3. What are the main characteristics of tornadoes?

The wind speed is 1. A 2。 12 is equivalent to more than 30 meters per second, which is naturally much worse than a tornado. 1On September 24th, 956, a tornado occurred in Shanghai, which actually lifted a three-or four-story oil storage tank, 1 10 ton, to 65438+. For example, why is a tornado so strong? The main reason is that a large amount of air escapes in the tornado, which makes the air in the center of the tornado very thin and the air pressure is very low, which is particularly different from the air pressure in the periphery. Make an explanation. This kind of wind is very destructive.

Actually, I'm doing it, but I can't find the answer. This is all I found. Take a look.