And that's tuff, actually. Tuff is a type of igneous rock formed by the consolidation of ash. Now let's talk about volcanic edifices. These monsters generally erupt thick, lava with explosive force. Mount St. Helen's in Washington state is a composite volcano.
Cinder cones are volcanic edifices that form from the buildup of pyroclastic materials.
Ash and little hot stuff that look like cinders shoot out of a vent, or opening in the ground, and then they fall back down around the vent, forming a steep-sided cone. These cones can grow pretty fast during an eruption, but they don't usually get more than 400 meters high. The cloud of gas and debris exploded out of the volcano. It traveled at about 100 miles per hour and wreaked tremendous havoc. Worldwide, there are two major volcano belts.