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11 Cards in this Set
- Front
- Back
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True or False: Sills cut across the layering in country rock? |
False |
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Which of the following is a deep intrusive structure? a.)sill b.)dike c.)volcanic neck d.)batholith |
d.)batholith |
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2 ways to melt a rock other than heating it up? |
1.)add water to a hot dry rock 2.)decrease its pressure |
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Magma forms at divergent plate boundaries because? |
decrease in pressure of the asthenosphere |
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Magma forms at convergent plate boundaries because? |
water is added to the asthenosphere |
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Pyroclasts are formed by the sudden release of ____ in magma |
dissolved gas |
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What is viscosity? |
The resistance to flow |
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The 2 major factors that determine whether an eruption will be quiet or explosive are: |
viscosity and dissolved gas |
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Which of the composition of lava are the most explosive? a.)ultra mafic b.)mafic c.)felsic d.)ferromagnesian |
c.)felsic |
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Which is bigger, a volcanic bomb or a volcanic block? |
neither, they can both be the same size |
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Which of the following volcanoes has the lowest slopes? a.)shield volcanoes b.)cinder cones c.)composite volcanoes d.)volcanic dome |
a.)shield volcano |
