Magmatism Flashcards
1
Q
Semi-liquid hot molten rocks beneath the Earth
A
Magma
2
Q
It is a process under the earth’s crust where formation and movement of magma occur.
A
Magmatism
3
Q
Where do magmatism occur?
A
Asthenosphere
4
Q
Where is the Asthenosphere located?
A
Lower part of Earth’s crush and upper portion of the Mantle.
5
Q
How is magma formed?
A
Through partial melting
6
Q
Different minerals in rocks melt at different temperature and pressure.
A
Partial melting
7
Q
Melting in the mantle requires one of three possible events to occur:
A
- Increase in temperature
- Decrease in pressure
- Addition of volatiles
8
Q
As magma rises, it is often hot enough to melt the rock it touches. It happens at convergent boundaries, where tectonic plates are crashing together.
A
Increase in Temp
9
Q
- during convection, these rocks tend to go upward and the pressure is reduced, this
triggers the melting of magma
(AKA decompression melting) - occurs at mid-ocean range
A
Decrease in pressure
10
Q
- When water or carbon dioxide is added to hot rocks, flux melting occurs. The melting points of minerals within the
rocks decrease. - occurs at subduction zones
A
Addition of volatiles
