Volcanoes Flashcards
1
Q
How do volcanoes occur at destructive plate margins
A
Oceanic crust is denser and it subducts beneath the continental crust . In the mantle the lithosphere melts making molten lava.
2
Q
What does V.E.I mean?
A
V.E.i means volcanic eruption index
3
Q
What is the V.E.i of a shield volcano?
A
0-3
4
Q
What is the V.E.I of a composite cone volcano?
A
4-7
5
Q
4 characteristics of a composite cone volcano?
A
Steep sided slopes
Found at destructive plate margins
Lava has high viscosity
Lava made of andesite
6
Q
4 characteristics of a shield volcano?
A
Found at constructive plate margins
Gentle sided slopes
Lava has low viscosity
Lava made from basalt
