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Hawaii Flo

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Karymsky Volcano in Kamchatka Peninsula, Russia.

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by miadolphins013 on Flickr.Spirit Lake with Mount St Helens in the background, Oregon, USA.

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by zekeafroid on Flickr.Inside Nyiragongo Volcano crater, Democratic Republic of Congo.

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by Jamedirk on Flickr.Lago de Coatepeque is a large crater lake in the east part of the Coatepeque Caldera near Santa Ana, El Salvador.