News tagged with volcanic ash

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The ashes of Mt. St. Helens

The massive eruption of Mt. St. Helens 35 years ago is one of the largest ever seen in North America. LMU volcanologists now report a retrospective analysis of salts leached from the ash deposited by the ...

dateJun 26, 2015 in Earth Sciences
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NASA image: Night-shining clouds

In the late spring and summer, unusual clouds form high in the atmosphere above the polar regions of the world. As the lower atmosphere warms, the upper atmosphere gets coooler, and ice crystals form on meteor ...

dateJun 22, 2015 in Earth Sciences
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How atmospheric rivers form

If you want to assign blame on an overcast day, then cast your eyes on the tropics. Water vapor originating from the Earth's tropics is transported to midlatitudes on long filaments of flowing air that intermittently ...

dateJun 09, 2015 in Earth Sciences
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Lightning plus volcanic ash make glass

In their open-access paper for Geology, Kimberly Genareau and colleagues propose, for the first time, a mechanism for the generation of glass spherules in geologic deposits through the occurrence of volcan ...

dateMar 03, 2015 in Earth Sciences
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Tongan volcano creates new island

A Tongan volcano has created a substantial new island since it began erupting last month, spewing out huge volumes of rock and dense ash that has killed nearby vegetation, officials said on Friday.

dateJan 16, 2015 in Earth Sciences
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