Volcanoes 101
The name for a weak spot in the Earth's crust where lava comes to the surface.
What is a volcano?
The space in the crust that holds magma.
What is the magma chamber?
The name of the force that pushes magma out of a volcano, causing eruptions.
What is pressure?
The type of volcanic mountain that is very wide and gently-sloping, formed by quiet eruptions.
What is a shield volcano?
What is a convergent boundary?
Molten rock, gases, and other substances that are underground.
What is magma?
The layers of hardened lava, ash, and rock that build up around the pipe of a volcano, giving it height.
What is the cone?
What is a quiet eruption?
A massive crater formed by the collapsing of the top of a volcanic mountain; they sometimes fill with water, making a lake.
What is a caldera?
The name for the chain of islands in the Pacific Ocean that were formed over time by a hotspot volcano.
Molten rock, gases, and other substances that are above ground.
What is lava?
The cylindrical tube connecting the magma chamber to the vent.
What is the pipe?
You call a volcano this if it is not currently erupting, but expected to erupt in the future.
What is dormant?
The type of volcano that is formed by alternating eruptions of lava, ash, and rock.
What is a composite volcano?
The processes of volcanic formation can be explained by this scientific theory.
What is the theory of plate tectonics?
The name for the chain of volcanoes found along the boundary of the Pacific Plate.
What is the Ring of Fire?
What is the vent?
The magma in an explosive eruption will have a high this.
What is viscosity?
The name for a piece of rock that formed from hardened magma in the pipe of a volcano.
What is a volcanic neck?
If a volcano forms at a divergent boundary in the ocean, it is most likely part of one of these.
What is a mid-ocean ridge?
This type of volcano forms above pockets of magma that appear in many places all over a plate.
What is a hot spot volcano?
What is the crater?
The name for large blobs of magma that erupt out of a volcano and harden before reaching the ground.
What are volcanic bombs?
An extrusion of magma that hardens in layers parallel to the horizontal layers of the crust.
What is a sill?
After a plate subducts at a convergent boundary and sinks back into the mantle, the plate will melt into magma. That magma will then rise through the asthenosphere into the crust, because of what property of the magma?
What is density?