Volcanoes and Plate Tectonics
The location in which volcanoes are mostly found
What are plate boundaries?
The main factor that accounts for the difference between quiet and explosive volcanic eruptions.
What is the silica content of the magma?
The huge hole left by the collapse of a volcanic mountain.
What is a caldera?
A wide, sloping mountain formed by runny lava and quiet explosions.
What is a shield volcano?
At what point does magma become lava?
At the Earth's surface.
Molten material before it reaches Earth's surface
What is magma?
The main hazard from a quiet volcanic eruption.
What are lava flows?
Tall, cone-shaped mountains in which layers of lava alternate with layers of ash.
What are composite volcanoes?
A volcano that is not erupting but shows signs of eruption in the distant future.
What is a dormant volcano?
This kind of eruption is likely to occur in a volcano that is low in silica.
What is a quiet eruption?
A belt of volcanoes along the plate boundary that runs along part of the west coast of the United States
What is the Ring of Fire?
The bowl-shaped area around a volcano's central vent.
What is a crater?
When magma hardens in a volcano's pipe, the result will eventually be a this landform.
What is a volcanic neck?
Molten rock and gas leave the volcano through this.
What is a vent?
Thin threads of volcanic lava glass.
What is Pele's hair?
These often occur along the boundaries of two oceanic plates
What are island arcs?
This provides to the force that causes magma to erupt to the surface.
What are the dissolved gases in the magma?
Formed when many layers of thin, runny lava build up a high, level area.
What is a lava plateau?
A mass of rock that forms when a large body of magma cools inside of the crust.
What is a batholith?
This type of lava rock forms from fast moving, thin, runny lava.
What is Pahoehoe?
Volcanoes can form at warm areas of the crust where molten material rises. What are these areas called?
Hot Spots
Pyroclastic flows typically occurs during what kind of eruption.
Explosive
Sometimes rising magma is blocked by horizontal layers of rock. The magma forces the layers of rock to bend upward into this landform.
What is a dome mountain?
This forms when magma forces itself between rock layers and hardens.
What is a sill?
This type of lava rock forms from thicker, cooler lava.
What is Aa?