Volcanoes 2 Flashcards
1
Q
Ways in which nature melts rocks
A
- divergent margin
- heat melting/hot spots
- convergent margin
2
Q
Basaltic Magma
A
-Low in SiO2 45-55 Wt% high in Fe,Mg,Ca Low in K,Na no quartz
3
Q
Andesitic Magma
A
-Intermediate in SiO2
-55-65% wt
intermed in Fe,Mg,Ca,Na,K
some quartz
4
Q
Rhyolitic
A
-high in SiO2
-65-75% wt
low in Fe,Mg,Ca
High in K,Na
lots of quartz
5
Q
Temperature of Basaltic
A
1000 to 1200 C
6
Q
Temperature of Andesitic
A
800 to 1000 C
7
Q
Temperature of Rhyolitic
A
650 to 800 C
8
Q
Non explosive eruptive Style
A
- low silica
- low gas content
- basaltic lava flows
9
Q
Explosive
A
- high silica
- high gas content
- pyroclastic
- andesitic
10
Q
lava fountain
A
benign gas emission from low viscosity magma and formation of cinder cone
