Ascending cloud from Redoubt Volcano, Alaska, from an eruption on April 21, 1990. The mushroom-shaped plume rose from avalanches of hot debris (pyroclastic flows) that cascaded down the north flank of the volcano.

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Photo credit: © Science History Images / Alamy / Afripics
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Keywords: alaska, beautiful, cloud, dramatic, eruption, explode, geology, history, landscape, mt., mushroom, mushroom-shaped, photo, redoubt, stratovolcano, volcano