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Frage | Antworten |
Mount Pinatubo, Philippines | Destructive plate boundary Eurasian plate subducted beneath pacific plate Composite volcano June 15th, 1991 |
Kilauea, Hawaii | Constructive plate boundary Convection currents in mantle pull plates apart No deaths as eruption was predicted Shield volcano Basalt lava |
Oceanic crust | Forms the land Thick Low density Mostly granite |
Oceanic crust | Under the sea Thin High density rock Mostly basalt |
Lithosphere | Top of mantle and crust |
Image:
constructive (image/jpg)
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Constructive plate margin |
Image:
collision_2 (image/png)
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Collision plate margin |
Conservative plate margin | |
Destructive plate margin | |
Balsatic magma | Shield volcano Usually found at constructive margins High temp, low silica, low gas content Fluid Little explosive activity |
Andesidic magma | Composite volcano Usually found at destructive margins Lower temp, more silica, dissolved gasses More likely to explode when reaches surface |
Granitic magma | Steep-sided dome volcano Low temp, high silica Very viscus and sticky Usually cools and becomes igneous rock before reaching surface |
Haiti | 12th January 2010 Conservative plate margin Plates move same direction 316,000 people killed, 1 million homeless |
Christchurch, New Zealand | 22nd February 2011 Conservative plate margin Plates move opposite direction 181 people killed |
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