The Monitor's weekly news quiz for May 23- 27, 2011

Test your news knowledge – from the obvious to the obscure – with our photo quiz.

2. The eruption of Iceland's Grímsvötn volcano is thought to be 1,000 times bigger than last year's volcanic eruption. Why hasn't it disrupted airplane flights this time?

Planes can easily fly around the plume


It was found that volcanic ash has no effect on jet engines


Prevailing winds are blowing the ash away from air routes


There's less ash in the air

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