Volcanoes and Plate tectonics
Volcanoes occur in belts along these.
What are plate boundaries?
This is the resistance of a liquid to flow.
What is viscosity?
All volcanoes have this beneath the surface.
What is a magma chamber?
This is a dead volcano that is unlikely to erupt again.
These are found at the top of a mountain that collapses inward and fills with water and snow.
Volcanoes occur along these two types of plate boundaries
What are divergent and convergent boundaries?
Magma that has a high amount of this compound is more viscous.
What is silica?
What is a pipe?
This is a volcano that is erupting or has shown signs that it may erupt.
What is an active volcano?
When magma hardens in the volcano's pipe and the soft rock around it wears away, this is formed.
What is a volcanic neck?
This is a string of islands resulting from subducting plates in the ocean.
What is an Island Arc?
Silica is made from these two elements.
What are silicon and oxygen?
Molten rock and gas leave through this opening.
What is a vent?
This type of volcano has highly viscous lava that builds up in the vent.
What is a cinder cone volcano?
Magma forces itself through rock layers to form these two landforms.
What are dikes and sills?
Along diverging plate boundaries, volcanoes form from these two types of areas.
What are mid-ocean ridges and rift valleys?
Heat has this affect on magma.
What is lowers its viscosity?
This type of eruption bubbles out gently and the magma has a low viscosity.
What is a quiet eruption?
This is a tall, cone-shaped volcano with lava layers alternating with ash layers.
What is a composite volcano?
Water heated by magma or hot rock rises to the surface and collects in a natural pool to form this.
What are hot springs?
This is an area where material from deep within the mantle rises and then melts, forming magma.
What is a hot spot?
Magma rises above a subducting plate after it melts because it has this quality compared to the surrounding rock.
What is less dense?
This is a mixture of hot gases, ashes, cinders, and bombs hurled out of an explosive eruption.
What is a pyroclastic flow?
This type of volcano is formed when thin layers of lava pour out of a vent and lava flows gradually over a gently sloping mountain.
What is a shield volcano?
This is a fountain of water and steam that erupts from the ground.
What is a geyser?