The most common type of volcano, a scoria cone forms from a Strombolian eruption and often only erupts once; they can sit on their own, or form parasitically off a shield volcano. A Strombolian eruption is characterized by short, explosive eruptions that can shoot hundreds of feet in the air but are do not have a sustained column of erupting lava. It forms the scoria by shooting basaltic rock around it, creating the piled-up cone shape.
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