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- 1. Multiple Choice
Which types of magma contains the least amount of SiO2rhyoliticandesiticfelsicbasaltic - 2. Multiple ChoiceRhyolitic magma is rich in _____.silicaironmagnesiumsulfur
- 3. Multiple ChoiceWhich of the following is not a factor that can affect magma compositionlacositymineral contentsilicawater content
- 4. Multiple ChoiceThe composition of magma determines its _____.viscositydarknesscolornone of the above
- 5. Multiple ChoiceWhich of the following gases is not typically found in volcanic activity?water vaporsulfurcarbon dioxideargon
- 6. Multiple ChoiceVolcanoes that are made of basalt lava flows are called _____.shield volcanoescomposite volcanoesstratovolcanoescone volcanoes
- 7. Multiple ChoiceVolcanoes are common alongconvergent plate boundaries.divergent plate boundaries.transform plate boundaries.two of the above
- 8. Multiple ChoiceAbout 75 percent of the world’s volcanoes are foundaround the Atlantic Ocean basin.
along the mid-Atlantic ridge.
around the Pacific Ocean basin.
throughout the American Northwest. - 9. Multiple ChoiceA line of volcanic activity that surrounds the Pacific Ocean basin is the
Ring of FireAleutian IslandsHawaiian IslandsCaribbean Islands - 10. Multiple ChoiceWhich of these volcanic particulates is the largest in size?BlockAshBombLapilli
- 11. Multiple ChoiceThis volcano is most likely which type of volcano?FelsicCompositeShieldCinder cone
- 12. Multiple ChoiceWhat is a determining factor in which type of eruption will occur?the chemistry of the magmathe size of the mountainthe climate around the volcanothe number of people living near the volcano
- 13. Multiple ChoiceWhich of the following factors helps determine whether a volcanic eruption will be violent or relatively quiet?amt of dissolved gasestemp of magmacomposition of magmaall of the above
- 14. Multiple ChoiceA lava flow with a surface of rough, jagged blocks and sharp, angular projections is called a(n) ____.pyroclastic flowaa flowpahoehoe flowash flow
- 15. Multiple ChoiceAs the temperature of lava increases, ________its viscosity decreaseit begins to hardenits viscosity increasesit can flow a much short distance
- 16. Multiple ChoiceWhich list places the magma types in order of decreasing viscosity (most viscous listed first)?basaltic, andesitic, rhyoliticrhyolitic, andesitic, basalticandesitic, basaltic, rhyoliticbasaltic, rhyolitic, andesitic
- 17. Multiple ChoiceHighly explosive volcanoes tend to have what type of magma?magma with high silica, high viscosity, and higher gas contentmagma with low silica, low viscosity, and lower gas contentmagma with low silica, high viscosity, and lower gas contentmagma with no silica, high viscosity, and no gas content
- 18. Multiple ChoiceThe particles produced in volcanic eruptions are called ____.laccolithspyroclastic materialcalderasvolcanic stocks
- 19. Multiple ChoiceWhat is the most abundant gas associated with volcanic activity?chlorinewater vaporsulfur oxidecarbon dioxide
- 20. Multiple ChoiceWhat type of volcano is built almost entirely from ejected lava fragments?cinder conecomposite coneshield volcanopahoehoe volcano
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