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Stack #814034
| Question | Answer |
|---|---|
| 3 factors that affect the formation of magma | temperature, pressure, and water |
| magmas are named after ____rocks | extursive |
| basaltic magma forms when rocks in the ____melt | upper mantle |
| basaltic magma contains small amounts of silica and a low____ | viscosity |
| andesitic magma forms from oceanic crust and____ | sediments |
| _____magma fuels volcanoes with intermediate eruption | andesitic |
| rhyolitic magma forms deep beneath ____crust | continental |
| rhyolitic magma has the highest____content of 3 types of magma | silica |
| rhyolitic magma has the same composition of____. also has a high viscosity and flows___ | granite , slowly |
| ___magma produces very explosive volcanoes. | rhyolitic |
| how does the viscosity of magma change as magma cools? | the amount of silica in magma increases viscosity |
| _=quick flow, low viscosity,50%silica _=resistance to flow, high V,70%silca | basaltic & rhyolitic |
| Intrusive igneous rock body | pluton |
| largest pluton | batholith |
| Irregular shape, pluton looks like batholith but smaller | stock |
| mushroom-shaped pluton | laccolith |
| pluton that is parallel to the rock it intrudes | sill |
| pluton that cuts across preexisting rocks | dike |
| process responcible for the formation of many plutons | mountain-building |
| lava erupts through an opening in earths surface called a ___ | vent |
| a bowl-shaped depression that forms around the vent of a volcano is a __ | crater |
| rock fragments thrown into the air during a volcanic eruption is___ | tephra |
| the smallest tephra are___ | dust |
| fast moving clouds of gas ash and other tephra are___ | pyroclastic flows |
| what forms when the top/side of a volcano collapses into magma chamber? | caldera |
| when magma reaches earths surface, it is called.... | Lava |
| underwater volcanoes that have not reached the surface | seamounts |
| where do volcanoes form? | subduction boundries, |
| these, form on the overriding plate oceanic/oceanic or oceanic/continental, 80% of volcanoes are found here | subduction boundriessss |
| major belts formed at convergent boundries. 1 | pacific ring of fire ( CIRCUM PACIFIC BELT) |
| major belts formed at convergent boundries. 2 | divergent boundries ( also occurs at midocean ridges called seafloor spreading) |
| major belts formed at convergent boundries.3 | hot spots |
| form when a plume of magma in the mantle is forced upwards through the curst. | Hot spots! |
| an explosive form of magma | rhyolitic |
| magma with the lowest viscosity | basaltic |
| magma with lowest gas content | bBBasaltic |
| has broad gently sloping sides and a nearly circular base | shield cone |
| small volcano with steep sides | cinder cone |
| most dangerous to humans, & fueled by magma that contains large amounts of silica , water and gases | composit/strauto |
Created by:
winston265