Earth's Moving Plates
Magma reaches Earth's surface and flows out through an opening called a ___.
Vent
High silica content makes it more likely that a volcano will erupt _____.
Violently
large opening caused by the collapse of the top of a volcano
Caldera
This type of volcano can have both quiet and explosive eruptions.
Composite volcano
What is the volcanic ash and debris that rush down the sides of the volcano called?
pyroclastic flow
Ash and cinders blown violently out of volcanoes
tephra
Formed when magma enters a vertical crack and hardens
dike
Soufriere hills volcano is an example of a ____ volcano
composite
______ form at the boundary between the mantle and the outer core.
Hot spots
steep-sided volcano made out of tephra
cinder-cone
largest intrusive igneous rock body
batholith
What kind of eruption occurs when granitic magma is present?
Explosive
A mountain that forms when layers of lava and ash erupt and build up
These TWO factors determine the explosiveness or quietness of an eruption
silica content and amount of water vapor/gasses trapped
Crater lake is an example of THIS igneous rock formation.
Caldera
Kilauea in Hawaii is the world's most _____ volcano.
Active
Where do volcanoes occur? Name the three places.
Convergent boundaries, divergent boundaries, and hot spots
volcano formed from alternating layers of lava and tephra
composite volcano
volcanic neck
Devil's Tower in Wyoming is an example of a
volcanic neck