Image of an ash plume from Mount Etna, Sicily, acquired on 4 December 2015 by the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor aboard the Terra satellite. Etna, Europe's largest and most active volcano, most recently began erupting on 2 December 2015.
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Sources: Etna volcano. volcanodiscovery.com; Etna volcano - eruption update. volcanodiscovery.com