Pyroclastic Materials

- Range in size from very fine dust and sand sized volcanic ash to pieces that weigh several tons
- particles produced when magmas are highly charged with gasses, and upon release they expand a thousandfold as they blow pulverized rock, lava, and glass fragments in the vent

Scoria- vesicular ejecta that is a product of basaltic magma
Pumice- Lighter in color and less dense than scoria

Anatomy of a Volcano

Cunduit/Pipe- terminates at a surface called a vent
Parasitic cone- produced when activity from a flank eruption, emits gasses called fumaroles

Cinder Cones

-also called scoria cones
- built from ejected lava fragments that take on the appearance of cinders or clinkers as they begin to harden while in flight
-Most abundant of the three major types of volcanoes

Composite Cones

-most dangerous volcanoes
-also known as stratovolcanoes
-Located at the rims of the pacific ocean, the ring of fire