Vent: a central opening in a volcanic area through which magma may escape.
Lava: magma that reaches Earth's surface and flows out of a vent.
Crater: a cuplike hollow that forms at the top of a volcano around the vent.
Cinder-cone volcano: a steep-sided cone that forms from explosive eruptions of hot rocks, ranging from particles to boulders.
Shield volcano: a wide, gently sloped cone that form from flows of lava.
Composite volcano: a cone formed from explosive eruptions of hot rocks followed by a flow of lava, over and over.
Geothermal energy: heat from below Earth's surface.
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