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12 Cards in this Set
- Front
- Back
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What is Magma? |
Molten rock underground |
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What is Lava? |
Molten rock on the surface |
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What is Igneous Rock? |
Formed from lava |
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What is meant by high silica content? |
The lava is thick (viscous) and explosive gases build up |
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What is meant by low silica content? |
The lava is runny (non-viscous) and less explosive as gases can escape |
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What are the tree types of Lava? |
Andesitic, Rhyolitic and Basaltic |
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Which are Viscous? |
Andesitic and Rhyolitic ( Destructive plate boundaries and violent eruptions) (Infrequent eruptions/ Dormant) |
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Which are non Viscous? |
Basaltic (Constructive plate boundaries and non-violent eruptions) (Frequent eruptions) |
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What are the %s of silica content? |
Andesitic (62) Rhyolitic (71) Basaltic (48) |
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Why are some eruptions explosive? |
The high silica content traps gases in magma, when pressure has built up, it will explode into eruptions |
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What shape are Viscous lava volcanoes? |
Steep sided volcanoes as lava doesn't flow far from vent before solidifying |
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What shape are Non-Viscous lava volcanoes? |
Gentle sided volcanoes as lava flows further away from the vent before solidifying |
