Volcano Vocab
a mountain created by molten magma and lava
a volcano
Made from repeating lava flows during quiet eruptions
shield volcano
indent at the top of a volcano
crater
Type of boundary where the plates come together.
Convergent Boundary
When the inside of the vent hardens and the rest of the volcano erodes away. example Devil's Tower
Volcanic neck
Area around the Pacific Ocean with lots of active volcanoes
Ring of Fire
Cinder cone volcano
The narrow, almost vertical crack in the center of a volcano where magma rises.
Central Pipe/Vent
A large rock mass formed when a large body of magma cools inside the crust
batholith
Magma that has reached the surface
Lava
Stratovolcano or composite volcano
A large room under a volcano where magma builds up.
Magma chamber
The area where one plate slides under another
Subduction zone
When magma squeezes between layers of rock
sill
When a volcano could erupt again, but hasn't for a very long time
dormant
Formed when a magma chamber empties out and the volcano collapses into it.
Caldera
The river of lava that pours down a volcano during an eruption
lava flow
What kind of plates converge to form a volcanic island arc?
Two oceanic plates
When magma squeezes between layers of rock and pushes the layers upward into a dome
laccolith
A place where a magma plume is burning through the middle of a plate creating a chain of volcanoes.
hot spot
Made when thick lava erupts and builds up slowly around the opening vent
lava dome volcano
A high speed cloud of burning gases, ash, and rocks that flow quickly down a volcano following an eruption.
Pyroclastic Flow
The denser type of plate
Oceanic
When magma forces itself across rock layers and hardens
dike