Volcano Structure 2
Terms
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- Smallest volcano type; has very steep sides
- Cinder cone shape and size
- Example: Izalco, El Salvador
- Example of Cinder cone
- Low viscosity, very little gas, 52% or less silica
- Basaltic magma composition
- Quiet eruptions (lava flow)
- Basaltic magma eruption
- Due to rocks in upper mantle
- Basaltic magma formation
- High viscosity, high gas, 66% or higher silica content
- Rhyolitic magma compostion
- Extremely explosive eruptions with lots of ash
- Rhyolitic magma eruption
- Mix with silica/water rich continemtal crust
- Rhyolitic magma formation
- Medium gas levels, 52%-66% silica content
- Andesitic magma compostion
- Explosive to intermediate eruptions
- Andesitic magma eruption
- Forms from ocean crust melting
- Andesitic magma formation
- Hot molten rock that is magma once outside of the volcano; cools to form igneous rock
- Lava
- Found inside the volcano, in the asthenosphere, crust/lithosphere; Hot molten rock plastic or gummy look
- Magma
- Forms pumice, obsedion, basalt, scoria; outside of volcano
- Extrusive igneous rock
- Forms granite, gabbro, andesite; inside of the volcano
- Intrusive igneous rock