Vocabulary
Solid bits of rock dropped from the air during an eruption.
What is tephra?
This type of magma has high silica and produces explosive eruptions.
What is granitic magma?
Name the three types of volcanoes.
What are composite, shield, and cinder-cone?
A sill runs (parallel / across) rock layers?
What is parallel?
Magma with high silica usually produces __________ eruptions.
What are explosive eruptions?
An opening where magma reaches Earth’s surface.
What is a vent?
This magma is silica-poor and produces quiet eruptions.
What is basaltic magma?
A composite volcano is formed from alternating layers of __________ and __________.
What are tephra and lava?
A dike cuts (parallel / across) rock layers.
What is across?
What forms when sulfurous gases mix with water vapor in the air?
What is acid rain?
A steep-walled depression around a volcano’s opening.
What is a crater?
This magma type forms at convergent boundaries and produces medium eruptions.
What is andesitic magma?
Volcanoes occur everywhere except here.
What are cool areas in the mantle?
A large intrusive igneous rock body formed underground.
What is a batholith?
Tephra + lava layers create this type of volcano.
What is a composite volcano?
A mixture of silicon and oxygen found in magma.
What is silica?
This is NOT a real type of magma: basaltic, granitic, andesitic, or limestone.
What is limestone magma?
Which islands formed from volcanic activity?
What are the Hawaiian Islands?
Magma hardens inside a vent, the volcano erodes away—this remains.
What is a volcanic neck?
A place where magma melts through the crust away from boundaries.
What is a hot spot?
What is a pyroclastic flow?
Pyroclastic Flow
Which two factors control whether an eruption is quiet or explosive?
What are silica and water vapor?
Where magma melts through the crust away from plate boundaries.
What is a hot spot?
The largest intrusive igneous features.
What are batholiths?
A steep-walled depression around a volcano's opening.
What is a crater?