Stack #814034
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| 3 factors that affect the formation of magma | temperature, pressure, and water
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| magmas are named after ____rocks | extursive
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| basaltic magma forms when rocks in the ____melt | upper mantle
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| basaltic magma contains small amounts of silica and a low____ | viscosity
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| andesitic magma forms from oceanic crust and____ | sediments
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| _____magma fuels volcanoes with intermediate eruption | andesitic
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| rhyolitic magma forms deep beneath ____crust | continental
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| rhyolitic magma has the highest____content of 3 types of magma | silica
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| rhyolitic magma has the same composition of____. also has a high viscosity and flows___ | granite , slowly
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| ___magma produces very explosive volcanoes. | rhyolitic
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| how does the viscosity of magma change as magma cools? | the amount of silica in magma increases viscosity
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| _=quick flow, low viscosity,50%silica _=resistance to flow, high V,70%silca | basaltic & rhyolitic
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| Intrusive igneous rock body | pluton
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| largest pluton | batholith
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| Irregular shape, pluton looks like batholith but smaller | stock
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| mushroom-shaped pluton | laccolith
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| pluton that is parallel to the rock it intrudes | sill
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| pluton that cuts across preexisting rocks | dike
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| process responcible for the formation of many plutons | mountain-building
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| lava erupts through an opening in earths surface called a ___ | vent
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| a bowl-shaped depression that forms around the vent of a volcano is a __ | crater
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| rock fragments thrown into the air during a volcanic eruption is___ | tephra
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| the smallest tephra are___ | dust
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| fast moving clouds of gas ash and other tephra are___ | pyroclastic flows
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| what forms when the top/side of a volcano collapses into magma chamber? | caldera
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| when magma reaches earths surface, it is called.... | Lava
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| underwater volcanoes that have not reached the surface | seamounts
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| where do volcanoes form? | subduction boundries,
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| these, form on the overriding plate oceanic/oceanic or oceanic/continental, 80% of volcanoes are found here | subduction boundriessss
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| major belts formed at convergent boundries. 1 | pacific ring of fire ( CIRCUM PACIFIC BELT)
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| major belts formed at convergent boundries. 2 | divergent boundries ( also occurs at midocean ridges called seafloor spreading)
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| major belts formed at convergent boundries.3 | hot spots
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| form when a plume of magma in the mantle is forced upwards through the curst. | Hot spots!
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| an explosive form of magma | rhyolitic
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| magma with the lowest viscosity | basaltic
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| magma with lowest gas content | bBBasaltic
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| has broad gently sloping sides and a nearly circular base | shield cone
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| small volcano with steep sides | cinder cone
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| most dangerous to humans, & fueled by magma that contains large amounts of silica , water and gases | composit/strauto
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