Hazards: Volcanic hazards Flashcards
What are 3 features of a shield volcano?
Constructive plate boundary and hotspots.
Gentle slopes and wide base.
Eruptions frequent, not explosive.
Formed with layers of runny lava but no ash.
What are 3 features of a composite volcano?
Destructive plate margins
Steep slopes and narrow base
Eruptions infrequent but violent
Formed with layers of ash and rock
What can a composite volcano also be know as?
stratovolcano
Silica content: Basaltic
45%-55%
Silica content:Andestic
55%-65%
Silica content:Rhyoltic
65%-75%
Temperature of eruption:Basaltic
1050-1200C
Temperature of eruption:Andestic
800-1000C
Temperature of eruption:Rhyolitic
650-800C
ViscosityBasaltic
low
ViscosityAndestic
medium
ViscosityRhyolitic
High
Gas contentBasaltic
Low
Gas content Andestic
Medium
Gas content Rhyolitic
High
Type of volcanoBasaltic
Shield
Type of volcanoAndestic
Composite
Type of volcanoRhyolitic
Composite