Volcanoes Flashcards
1
Q
Volcano
A
A weak spot in earths crust where molten material or magma comes to the surface
2
Q
Magma
A
Molten mixture of rock
3
Q
Lava
A
When magma reaches earths surface
4
Q
One major belt
A
Ring of fire formed by many volcanoes that rim the Pacific Ocean
5
Q
Fractures
A
Allow magma to reach the surface forming belts along the boundaries
6
Q
Hot spot
A
Area where material from deep within the mantle rises then melts forming magma
7
Q
System
A
Magma chamber
Pipe vent
Lava flows
Crater
8
Q
Quiet explosives
A
Magma has low silica
9
Q
Explosive eruptions
A
Has magma with high silica
10
Q
Dormant volcano
A
Not active but may become active
11
Q
Extinct volcano
A
Unlikely to erupt again
