Cinder cone
Steep hill of pyroclastic fragments around a volcanic vent / From Wikipedia, the free encyclopedia
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For peaks named "Cinder Cone", see List of peaks named Cinder Cone.
A cinder cone (or scoria cone[1]) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent.[2][3] The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as either cinders, clinkers, or scoria around the vent to form a cone that often is symmetrical; with slopes between 30 and 40°; and a nearly circular ground plan.[4] Most cinder cones have a bowl-shaped crater at the summit.[2]