Size of Ash from Icelandic Volcano Stuns Scientists

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http://www.ouramazingplanet.com/iceland-volcano-ash-plume-measured-0457/

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This give us an idea of how the ash may be affecting us in our future...

"The team also found that the ash plume blocked an extraordinary amount of sunlight. Measurements indicated that 50 percent to 80 percent of incoming sunlight was scattered by the plume, Ansmann said, although he added that much of that sunlight would have been scattered toward Earth, so that the actual reduction of sunlight below the ash layer was probably closer to 10 percent to 25 percent."