work in small groups to collect and present information about cyclones in South Asia?
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Answer:
A cyclonic storm (hurricane, typhoon, cyclone, depending on location) is a heat engine. Water vapour is the fuel. When the sea surface is above 27.5 degrees Celsius (81.5 Fahrenheit), the evaporating water lowers air pressure. Random variations in wind can concentrate this so you get a swirl, something like water going down a plughole, but upside down.
This draws in more moisture-laden air from all around, so it feeds itself and grows.
As long as it is over warm water, it keeps going. Usually, the progress one way or another is slow, say 5–10 km/h (2–5 mph) but the storm has a large diameter, and so the winds swirling around it get up to a great speed.
If it goes over land, it soon runs out of fuel. Same if it moves over cooler water.
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