This is what magma is called when it reaches Earth's surface.
What is Lava?
100
The 3 types of volcanoes.
What are Shield, Cinder Cones, and Composite?
100
The 3 types of magma.
What are Basaltic, Andesitic, and Rhyolitic?
100
This is an igneous intrusive rock body.
What is a Pluton?
100
True or False, an increase in silica increases the magma's viscosity?
What is True?
200
A bowl shaped depression at the top of a volcano that is less than 1 km in size.
What is a crater?
200
Many shield volcanoes are found here.
Where is Hawaii?
200
Basaltic magma has less than ___ % silica.
What is 50% ?
200
A lens shaped pluton is called this.
What is a Laccolith?
200
True or False, an increase in temperature increases the viscosity of magma?
What is False?
300
Lava reaches the surface through this tubelike structure.
What is a Counduit?
300
The Hawaiian islands are extinct volcanoes that were formed from these things under the ocean.
What are Hot Spots?
300
Four factors that affect magma's composition.
What are Temperature, Pressure, Amount of Dissolved Gas, and Silica Content?
300
Magma that intrudes parallel to preexisting rock is called a ___, while magma that intrudes horizontally is called a dike.
What is a Sill?
300
The area surrounding the Ring of Fire.
What is the Pacific Ocean?
400
When surface material collapses and water fills the caldera, this is created.
What is a scenic lake?
400
Name the slopes of each type of volcano.
What are gentle/gradual, steep/cone shaped, and curved slopes?
400
Magma with a low silica content has ___ viscosity, while magma with a high silica content has ___ viscosity.
What is Low and High?
400
Intrusive igneous rocks are classified by these 3 factors.
What are size, shape, and relationship to the surrounding rock?
400
If magma is ___ dense than the surrounding material, it will rise and create a volcanic eruption.
What is Less?
500
This type of volcanism occurs at subduction zones, when an oceanic plate dips under a continental plate to melt the mantle and magma rises to the surface.
What is Convergent Volcanism?
500
These are rapidly moving clouds of tephra mixed with hot gases.
What are pyroclastic flows?
500
This type of volcanism produces the most lava annually.