The atmospheric anomaly, which measured more than 310 miles wide and 620 miles long, was caused by dust clouds blowing east from Australia's dry interior, which has been parched by the worst drought on record. It covered dozens of towns and cities in two states as strong winds snatched up tons of topsoil, threw it high into the sky and carried it hundreds of miles.
The dust hanging over Sydney had largely cleared by midafternoon, although national carrier Qantas said severe delays would last all day because of diverted and late-running flights.
Further north, in the Queensland capital of Brisbane, the sky remained red into the early evening.
The storms visible as a huge brown smudge in satellite photographs of Australia on Wednesday were the most severe since the 1940s, experts said.
"These dust storms are some of the largest in the last 70 years," said Nigel Tapper, an environmental scientist at Monash University. "Ten very dry years over inland southern Australia and very strong westerlies have conspired to produce these storms."
1.What is the best title of the passage?(Please answer within 1 0words.)
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2.Which sentence in the passage can be replaced by thefollowing one?International flights have been put off more than six hours at theairport and flights at home may have to be put off about threehours.
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