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Noctilucent clouds get an early start

Every summer, something strange and wonderful happens high above the north pole. Ice crystals begin to cling to the smoky remains of meteors, forming electric-blue clouds with tendrils that ripple hypnotically ...

dateJun 10, 2013 in Earth Sciences
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Mexico volcano spews ash on towns

Mexico's Popocatepetl volcano spewed a new column of ash late Tuesday, with some of the material falling on three towns while glowing rocks landed on the towering mountain's slope.

dateMay 15, 2013 in Earth Sciences
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