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Explosiveness of an Eruption (Low (Runny (Travels Faster (Shield…
Explosiveness of an Eruption
Low
Runny
Travels Faster
Shield Volcanoes
Hotter
Less Silica
<50% Silica = Basaltic Magma
Low Gas > Effusive Content
High
Thick
Travels Slower
Composite Volcanooes
Sometimes blocks vent > Pressure > More explosive
Cooler
More Silica
70% > *Rhyolitc Lava
Traps Gas Bubbles > Explosive
Medium Sized Eruptions
60% Silica = Andesite
Magma = Silica + Oxygen > Viscosity