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Ashish Acharya
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Ash from volcanic eruptions can be swept in a narrow direction by the wind. When the wind changes direction so, too, does the location of the ashfall.

Ash plume from Sarychev Peak, Kuril Islands, as imaged by the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors on NASA’s Terra satellite on June 14, 2009.
Ash plume from Sarychev Peak, Kuril Islands, as imaged by the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors on NASA’s Terra satellite on June 14, 2009.
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