CINDER CONE VOLCANOS BY THE GREAT TABLE 2

GENERAL CHARACTERISTICS Also called a scoria cone, is a volcano composed of volcanic cinders (scoria) or small, rough particles of hardened lava. When lava that is highly charged with gas bubbles erupts from a vent under pressure, it tends to shoot straight up into the air. This effect is called a fire fountain, and it can sometimes be hundreds of meters high. Blobs of the frothy lava break apart, cool quickly, and fall relatively close to the vent. Over time, a cone-shaped hill builds up around a circular crater.

MODE OF FORMATION They are built from particles and blobs of congealed lava ejected from a single vent. As the gas- charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone. Most cinder cones have a bowl-shaped crater at the summit and rarely rise more than a thousand feet or so above their surroundings. Cinder cones are numerous in western North America as well as throughout other volcanic terrains of the world.

TYPE OF MAGMA Felsic ( very explosive) high in silica has pyro clastic materials ( such as tephra)

LIKELY TO BE FOUND It is divergent plate boundary.

FOUND IN THE U.S. Twins butte Rocky butte