volcanic activity and land forms
- Created by: 14whifre
- Created on: 12-05-21 09:10
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- Volcanic Activity & Landforms
- Effusive Eruption
- divergent plate boundary
- basalt lava
- low % silica
- low viscosiy
- high temp at eruption
- shield volcano
- gas bubbles expand freely
- limited explosive force
- Explosive Eruptions
- convergent plate boundary
- rhyolite and andesite
- acidic (high % silica)
- high viscosity
- low temp at eruption
- cone volcano
- violent bursting gas bubbles when magma reaches surface
- highly explosive
- vent + top of cone often become shattered
- Hot Spots
- characteristics
- shield volcano
- plume of magma rises from mantle + erupts at surface
- associated with intense volcanic activity + eruptions of basaltic lava
- plate moves away from hot spot, lose source of lave + become extinct
- characteristics
- Intrusive Volcanic Activity
- laccolith
- mass of igneous rock
- typically lens shaped
- intruded between rock strata causing uplift in the shape of a dome
- magma under high pressure forces rock upwards
- sill
- magma forced along layers of rocks
- parallel to rock
- pykes
- cut through layers in sedimentary rock
- perpendicular to rock
- laccolith
- Effusive Eruption
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