关于沙尘暴的英语课件.ppt
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1、1.Sandstorm is a meteorological phenomenon commonly found in arid and semi-arid regions.It is resulted from convection currents created by intensive heating of the ground.These currents can create wind up to 120km/h and appear as a solid wall of dust as much as 1,525m high which blow over a long dis
2、tance.2.Sandstorm is a kind of climatic hazard.It occurs when strong wind raises and carries along clouds of sand or dust which is so dense that it obscure the sun and reduce visibility to less than 1 km.Sandstorm usually occurs in deserts or areas near to arid and semi-arid regions.It was found in
3、areas like Sahara Desert in North Africa,Central Australia,Southwest of USA,Central Asia and Northwest China.3.Sandstorms have been more serious in recent years.They occur earlier in the season and are affecting a wider area.In 2006,they came a week earlier and the affected area had extended beyond
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