Volcanoes have varied shapes and sizes, but are divided into three main kinds depending on the type of material that reaches the surface and the type of eruption that ensues. These volcanoes are the largest and form symmetrical cones with steep sides. The lava spreads out and builds up volcanoes with broad, gently sloping sides. The low-profile shape resembles a warrior's shield. Currently active volcanoes of this type are found in the Hawaiian islands.
Cinder cones build from lava that is blown violently into the air and breaks into fragments.
Cinder cones are the smallest volcanoes and are cone-shaped. Cinder cones are found in many areas of Utah including Millard, Iron, Garfield, Kane, and Washington Counties, and they vary in age. The youngest, only about 600 years old, are in the Black Rock Desert in Millard County. Students can make models of the three volcanoes with clay or play dough of several colors on cardboard or cardstock. Students can investigate different types of eruptions.