PRESENTATION OUTLINE
A shield volcano is when lava flows gradually building a wide gently sloping mountain.
A cinder cone is when the lava produces ash,cinders, and bombs, and these materials build up around the vent in a steep, cone shaped hill or a small mountain.
Composite volcanoes are tall, cone shaped mountains in which layers of lava alternate with layers of ash.
A caldera is a huge hole left by the collapse of a volcanic mountain.
A volcanic neck forms when magma hardens in a volcanoes pipe. The softer rock around the pipe wears away, showing the hard rock of the volcanic neck.
A dike is when magma that forces itself across rock layers and hardens.
A sill is when magma squeezes between horizontal layers of rock.
A batholith is a mass of rock formed when a large body of magma cools inside the crust.
In geothermal activity, magma a few kilometers beneath Earth's surface heats underground water.
A geyser is a fountain of water and steam that erupts from the ground.
