Cinder-cone

cinder cone

noun Geology.
a small, conical volcano built of ash and cinders.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
cinder cone   (sĭn'dər)  Pronunciation Key 
A steep, conical hill consisting of glassy volcanic fragments that accumulate around and downwind from a volcanic vent. Cinder cones range in size from tens to hundreds of meters tall.
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