Moderate to violent eruptions throwing volcanic ash, cinders and lava into the air

Largest type of volcano

A relatively small cone of volcanic material formed from tephra

Sometimes erupts violently, forming a layer of tephra, sometimes a quieter eruption forming a lava layer

Forms along subduction zones

Buildup of basaltic layers, forming a broad volcano with gently sloping sides

Forms where magma is being forced up from the extreme depths within Earth, or in areas where Earth's plates are moving apart

Sunset Crater, near Flagstaff Arizona

Mount Saint Helens, in Washington

A steps side mountain composed of alternating layers of lava and tephra

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