How they form
Cracks or fractures along plate boundaries.
What are fissures?
The smallest type of volcano that usually erupts only once.
What is a cinder cone volcano?
Lava that pours out quickly forming jagged pieces ("ouch").
What is Aa?
Magma or igneous rock that is high in magnesium and iron content.
What is mafic?
Mudflows made of pyroclastic material and water.
What is lahar?
Increased temperature and decreased pressure.
What is magma formation?
Has gently sloping sides.
What is a shield volcano?
The smallest type of pyroclastic material.
What is ash?
Volcanoes that have not erupted in recorded history.
What are extinct?
Volcanic energy used to heat homes.
What is geothermal energy?
Mountain chains at divergent boundaries.
What are mid-ocean ridges?
Stratovolcanoes.
What is a composite volcano?
Lava that oozes, but does not travel far.
What is blocky lava?
Volcanoes that are not currently erupting but have erupted "recently."
What are dormant?
Abrasive, used in soaps and face scrubs.
What is pumice rock?
Where most volcanoes form.
What are plate boundaries?
The composition of very runny lava.
What is low silica content?
Pebble-like bits of pyroclastic material.
What is lapilli?
Volcanoes that are in the process of erupting.
What is active?
Nutrient-rich soil, rocks for construction, decrease in global temperatures.
What are long-term effects of a volcanic eruption?
Magma with a high water content will form this kind of eruption.
What is explosive?
Columns of hot rock (Hawaii).
What is mantle plume (hot spot)?
The easiest type of flow to escape.
What is lava flow?
The point on the surface where magma leaves the volcano's pipe.
What is a vent?
Island of "fire and ice."
What is Iceland?