The eruption of a volcano under the Eyjafjallajokull glacier of Iceland on Wednesday, April 14, sent ripple effects around the globe as it halted international flights to and from Northern Europe. Airborne volcanic ash posed a threat to jet engines, and to prevent disaster, air traffic controllers grounded planes. From the earliest moments of the eruption, a global network of Volcanic Ash Advisory Centers began monitoring the ash plume and the appropriate centers issued advisories about flow of the ash through the atmosphere. There are nine such centers, each responsible for a defined geographic region. (More) (Video clip) (Image of ash cloud)
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