GHC: Volcanism Flashcards
1
Q
We locate volcanoes in the context of what?
A
plate tectonics
2
Q
What qualities of volcanic eruptions do we analyze to understand them? What do these qualities determine?
A
Chemical composition, viscosity, gas content, and volume. If they are are peaceful or explosive.
3
Q
of 3 V’s of volcanology
A
Volatiles, Viscosity, and Volume
4
Q
90% of volcanism is associated with…? Remaining 10% of volcanism occurs where?
A
two plate boundaries. above hot spots.
5
Q
80% of volcanism at what plate boundary?
A
spreading centers.
6
Q
About 10% of volcanism at what plate boundary?
A
subduction zones.
7
Q
Subduction carries oceanic plate (with water-rich sediments) into hotter mantle, where released water lowers the melting temperature of the asthenosphere = basalt
A
.
