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Chapters 3/4 Quiz
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Questions in this quiz (24)
1Extrusive igneous rocks are typically fine grained because they crystallized slowly, deep below the Earth's surface.
- ATrue
- BFalse
2A dike is a discordant intrusive igneous structure.
- ATrue
- BFalse
3Mafic igneous rocks are silica-poor
- ATrue
- BFalse
4Igneous rocks may be either ____ if they form on or near Earth's surface, or ____ if they solidify under ground.
- Aintrusive; volcanic
- Bvolcanic; extrusive
- Cextrusive; intrusive
- Dplutonic; intrusive
- Eintrusive; extrusive
5______ are fragments of country rock that are distinct from the body of igneous rocks in which they are enclosed.
- AClasts
- BChill zones
- CPhenocrysts
- DXenoliths
- ENecks
6_______ igneous rocks, like gabbro and basalt, are silica-deficient with high magnesium and iron.
- AFelsic/silicic
- BIntermediate
- CMafic
- DIntrusive
- EExtrusive
7Fine-grained igneous rocks (grains < 1.0 mm) that have small grains cooled rapidly and are likely to be _____.
.- Aextrusive
- Breclusive
- Cintrusive
- Dobtrusive
- Epreclusive
8A _____ is a tabular (thin but large area) intrusive body that is concordant (parallel to the host rock structure).
- Adike
- Bmantle
- Cthreshold
- Dsill
- Eneck
9_____ are extremely coarse-grained with crystal up to 10 meters across.
- AGranites
- BUltramafic
- CBasalts
- DPegmatites
- EMarbles
10_____ rocks have coarse crystals in a fine-grained matrix.
- AUltramafic
- BGranite
- CSill
- DPegmatite
- EPorphyritic
11Igneous rocks that are silica-rich with high aluminum, sodium, and potassium are _____ rocks.
- Asilicic
- Bultramafic
- Cmafic
- Dextraterrestrial
- Eintermediate
12Ultramafic igneous rocks are composed almost entirely of ____.
- Afeldspar
- Bquartz
- Cferromagnesian minerals
- Dcalcite
- Ediamonds
13____ is the predominant igneous rock of the continents.
- ABasalt
- BGranite
- CRhyolite
- DGabbro
- ELimestone
14Geologists regard basaltic magma (Hawaiian lava, for example) as the result of the partial melting of ultramafic rock in the ____.
- Aoceanic crust
- Bcontinental crust
- Cmantle
- Douter core
- Einner core
15On its slow journey through the crust, mafic magma evolves into intermediate magma by differentiation and assimilation of ______.
- Amantle rocks
- Bbasalt
- Cgabbro
- Dsilicic rocks
16The crust beneath the world's oceans is mafic _______.
- Airon
- Basthenosphere
- Cgranite and rhyolite
- Dbasalt and gabbro
- EAnswers iron, asthenosphere, and granite and rhyolite are all correct.
17What type of melting takes place when a body of hot mantle rock moves upward and the pressure is reducted to the extent that the melting point drops to the temperature of the body?
- Adecompression melting
- Bsubduction melting
- Cdepressurized melting
- Dexfoliational melting
- Emantle plume melting
18Granite and ________ are composed predominantly of feldspar and quartz.
- Aoceanic crust
- Bdiorite
- Cbasalt
- Drhyolite
- Eultramafics
19Viscosity is a property of a fluid that relates to how easily the fluid flows. A material that is viscous _____.
.- Aflows easily
- Bflows less easily
- Cis always hot
- Dis always a solid
- Eis always cold
20Imagine two magmas that are identical in all respects (for example, same chemistry, pressure, volume) except that one magma is hotter than the other. Which magma will have the higher viscosity?
- AThe hotter magma will be more viscous.
- BThe cooler magma will be more viscous
- CThe magmas will have the same viscosity
- DThere is not sufficient information to establish the relative viscosities of these magmas
- ETemperature does not affect magma viscosity
21What is the process through which magma differentiation takes place?
- Acrystal settling
- Bpartial melting
- Cviscosity of the magma
- Dheating of the country rock
- Esubduction
22______ refers to a rock's appearance with respect to the size, shape, and arrangement of its grains or other constituents.
- ACrystallinity
- BTexture
- CExtrusiveness
- DMagma
- EViscosity
23______ is a frothy volcanic glass with so much void space that it can actually float.
- AObsidian
- BSponge rock
- CPumice
- DLava
- EA floater
24_____ are cavities in extrusive rocks resulting from gas bubbles in the lava.
- APhenocrysts
- BPleochroic
- CVesicles
- DVascular
- EHoly
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- Quiz on Chapters 3/4 Quiz, created by Ryan McMillan on 15/02/2016.
- Author
- Ryan McMillan
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- English
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