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Cinder cone
A volcanic cone made entirely of volcanic cinders and bombs. Cinder cones have very steep sides.
If you walk on this kind of cone, it feels like walking over the cinders from a coke fire. The cinders contain many gas bubbles that makes them lightweight.
Cinder cones often form very quickly, although few are large. Many cinder eruptions build small cones on the sides of existing volcanoes (see: Parasitic cone). Very occasionally they make up entire volcanic mountains. The famous volcano Paricutin in Mexico grew 300m in one year (1944) and was 410m high when it stopped erupting eight years later. Because it is all made of the same rough material, the sides stand at the same slope— about 33°—more than twice as steep as most volcanoes.
One area with a large number of cinder cones is in Idaho, in a place called the Craters of the Moon.
 Cinder cone—Cinder cones are relatively small volcanic cones. This example is from the Craters of the Moon National Monument, Idaho.
Colliding boundary
One of the edges of the Earth’s tectonic plates where two continental plates collide. Usually one plate is pushed under the other. The boundary is a common location for earthquakes and explosive volcanoes, island arcs, and ocean trenches. Colliding boundaries also coincide with subduction zones. The most active colliding boundary lies around the Pacific Ocean (see: Pacific Ring of Fire).
Complex volcano
A volcano that has two or more vents.
Composite volcano
A steep-sided volcano, usually formed into a cone and made of both lava and ash in alternating layers. (See also: Central vent volcano and Stratovolcano.)
Cone
The shape of an explosive type of volcano. A caldera is a collapsed cone. (See also: Parasitic cone.)
 Cone—This is Mt. Shasta, one of the most prominent cones in the Cascade Mountains.
Cone
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