- Magma is andesitic to rhyolitic. The lava is increasing in viscosity due to a higher silica content, which traps gases, making the lava more sticky and less able to flow.
- Eruptions can potentially be explosive, due to the build up of pressure. This build up of pressure can mean that eruptions can reach heights of over 17km to the tropopause (the lowest major atmostpheric layer.)
- Materials produced- Tephra and pyrcolastic flows.
- Eruptions are spardic, with periods of dormancy.
- Destructive margins form acid lava domes and composite cone volcanoes.
- Classification- Vulcanian > Plinian.
Q) In what way does volcanic activity vary in relation to the type of plate margin along which it occurs? (10)
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