Volcanoes and Plate Tectonics
Volcanic Activity
Stages of Volcanic Activity/Volcanic Landforms
Volcanic Landforms Cont.
Volcanic Lanforms Cont.
100
A weak spot in the crust where magma comes to the surface.
What is a volcano?
100
Because it is less dense then the ground around it.
Why does magma rise?
100
This is erupting or will erupt soon.
What is an active volcano?
100
Steep cone shaped hill or mountain. Ash, cinders, and bombs pile up.
What is a cinder cone volcano?
100
Horizontal- magma hardens between layers of rock.
What is a sill?
200
Magma that reaches the surface.
What is lava?
200
Rising magma reaches a weak spot in the surface.
What is an eruption?
200
This is dead and unlikely to ever erupt again.
What is an extinct volcano?
200
Tall cone shaped hill or mountain. Alternating layers and ash.
What is a composite volcano?
200
Magma pushes rock up like a dome.
What is a dome mountain?
300
Molten material in the mantle. Includes rock forming substances, gases, and water.
What is magma?
300
A pocket of magma beneath the surface.
What is a magma chamber?
300
This is sleeping and may erupt someday.
What is a dormant volcano?
300
Huge eruption empties vent, pipe, and magma chamber. Mountain collapses in like a huge hole.
What is a caldera?
300
Large mass of magma hardens in rock, outside erodes away.
What is a batholith?
400
An area where magma melts through the crust like a blow torch. It is NOT near a plate boundary.
What is a hot spot?
400
Forms around the vent and looks like a bowl.
What is a crater?
400
Runny thin lava flows out and hardens into a flat surface.
What is a Lava Plateau?
400
Magma hardens in pipe, and the outside erodes away.
What is a volcanic neck?
400
Magma erupts out of the volcano and becomes lava. The lava hardens and forms rock, which adds new land to the surface.
In what ways are volcanoes a constructive force?
500
A belt of volcanoes around the rim of the Pacific Ocean.
What is the Ring of Fire?
500
The content affects the thickness of magma.
What is silica?
500
Layers of lava pour out of vent and harden on top of other layers.
What is a shield volcano?
500
Vertical- magma hardens across layers of rock.
What is a dike?
500
A plate subducts under another, then it becomes very hot and melts. The magma then rises and slips through the fractured rock.
Why do so many volcanoes occur along convergent plate boundaries?
M
e
n
u