Plate Boundaries
Plate Tectonics
Volcanoes
Composite Volcanoes
Boundaries
100
What is the theory of plate tectonics?
Earths crust is made up of plates that rise to the top of the astenosphere
100
What is a shield volcano?
Layers of runny lava, very wide, non explosive
100
How are composite volcanoes formed ?
When 2 continental boundaries strike each other
100
What is a convergent boundary?
Controlled by the type of crust invaded and forces acting on the plate
200
What is a strato volcano/composite?
Form from both explosive & non explosive eruptions
200
What is oceanic crust?
High density, thin, dark colored, basalt
200
What is a cinder cone volcano ?
Smallest volcano, made from pyroclastic material, explosive
200
Why are composite volcanoes explosive?
Due to the gases built up inside
200
What is a Divergent boundary?
Seafloor spreading is the process by which plate tectonics produce new oceanic litosphere
300
What are 2 types of eruptions?
Explosive and non explosive
300
What is oceanic crust?
Low density, thick, light colored, granite
300
What is explosive ?
Convergent boundary, volcanoes that build enough pressure to blow its top, sending pyroclastic material into the air
300
What comes out of composite volcanoes?
Pyroclastic materials
300
What is a transform boundary?
At a transform fault boundary, plates grind past each other without destroying the lithosphere.
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