Cinder cone

 Puu Oo, a cinder cone located the eastern rift zone of the Kīlauea volcano of the Hawaiian Islands

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A cinder cone or scoria cone is a steep conical hill of tephra (volcanic debris) that accumulates around and downwind from a volcanic vent. Cinder cones are commonly found on the flanks of shield volcanoes, stratovolcanoes, and calderas.