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10 Cards in this Set
- Front
- Back
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Why are some volcanoes more hazardous than others? |
Proximity to Population Plate Margins Viscosity of Magma Explosiveness of eruptions Material Ejected Prediction, forecast and Reactions Frequency and Perception of Risk |
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Constructive plate boundary characteristics? |
Plates moving away from each other Basic magma Basaltic lava Non-Viscous Fast flowing |
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Destructive plate boundary characteristics? |
Plates moving towards each other Acidic magma Forms Andesitic or Rhyolitic lava Viscous Slow running |
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Basaltic characteristics? |
Low silica content (48%) Non-explosive Frequent eruptions Gentle sided volcanoes |
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Andesitic characteristics? |
High silica content (62%) Explosive Infrequent eruptions Steep sided volcanoes |
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Rhyolitic characteristics? |
Very high silica content (72%) Explosive Infrequent eruptions Steep sided volcanoes |
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Silica content of Basaltic? |
48% |
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Silica content of Andesitic? |
62% |
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Silica content of Rhyolitic? |
71% |
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How are Explosiveness of Eruptions measured? |
Volcanic Explosively Index (0-8) |
