Eas 2600 - 1

25 Questions | Total Attempts: 14

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Eas 2600 - 1

Questions and Answers
  • 1. 
    The classification of igneous rocks is dependent on texture and __________.
    • A. 

      The relative proportion of vesicles

    • B. 

      The relative proportion of silicate minerals

    • C. 

      The relative proportion of pyroclastic material

    • D. 

      The relative proportion of phenocryst minerals

  • 2. 
    When cleaved, mica breaks through planes of __________.
    • A. 

      Silicon-oxygen tetrahedra

    • B. 

      Interlayer cations

    • C. 

      Sulfate anions

    • D. 

      Aluminum hydroxide

  • 3. 
    Minerals can form by which of the following processes?
    • A. 

      Crystallization from molten magma

    • B. 

      Precipitation of materials dissolved in liquids such as water

    • C. 

      Neither crystallization nor precipitation

    • D. 

      Both crystallization and precipitation

  • 4. 
    What is the term for atoms of the same element that have different numbers of neutrons?
    • A. 

      Ions

    • B. 

      Electrons

    • C. 

      Polymorphs

    • D. 

      Isotopes

  • 5. 
    Which of the following best describes an andesite?
    • A. 

      A fine-grained, intermediate igneous rock

    • B. 

      A coarse-grained, felsic igneous rock

    • C. 

      A fine-grained, felsic igneous rock

    • D. 

      A coarse-grained, intermediate igneous rock

  • 6. 
    Which of the following minerals is common in both felsic and mafic igneous rocks?
    • A. 

      Plagioclase feldspar

    • B. 

      Pyroxene

    • C. 

      Quartz

    • D. 

      Olivine

  • 7. 
    How many of the oxygen atoms in the silicate tetrahedron are shared in framework silicates?
    • A. 

      Four

    • B. 

      One

    • C. 

      Two

    • D. 

      Three

  • 8. 
    Which of the following properties increases in the direction of the arrows in the diagram below?
    • A. 

      Potassium content

    • B. 

      Viscosity

    • C. 

      Melting temp

    • D. 

      Silica content

  • 9. 
    At approximately what temperature does olivine crystallize from a mafic melt?
    • A. 

      2000°C

    • B. 

      300°C

    • C. 

      600°C

    • D. 

      1200°C

  • 10. 
    In identical mineral structures, cations of similar sizes often substitute for each other. Based on size similarities which of the following pairs would you expect to substitute with most ease?
    • A. 

      Mg+2and Fe+2

    • B. 

      Si+4and K+

    • C. 

      Na+and K+

    • D. 

      Ca+and Mg+2

  • 11. 
    Mantle plumes generate large volumes of ________ magmas.
    • A. 

      Peridotitic

    • B. 

      Rhyolitic

    • C. 

      Basaltic

    • D. 

      Andesitic

  • 12. 
    Which of the following best describes an igneous rock with 10 millimeter crystals set in a fine-grained matrix of 0.5-millimeter crystals?
    • A. 

      Vesicular

    • B. 

      Porphyry

    • C. 

      Pyroclastc

    • D. 

      Granitic

  • 13. 
    The atomic mass of an element is equal to the number of ______.
    • A. 

      Protons plus neutrons

    • B. 

      Protons plus neutrons plus electrons

    • C. 

      Protons

    • D. 

      Neutrons

  • 14. 
    Which of the following is a good estimate of the melting temperature of a typical felsic crustal rock?
    • A. 

      700°C

    • B. 

      250°C

    • C. 

      100°C

    • D. 

      2000°C

  • 15. 
    What type of magma forms when the upper mantle undergoes decompression melting?
    • A. 

      Mafic

    • B. 

      Felsic

    • C. 

      Ultramafic

    • D. 

      Intermediate

  • 16. 
    The Great Rift Valley of East Africa is an early-stage _________.
    • A. 

      Transform boundary

    • B. 

      Convergent boundary

    • C. 

      Deep-sea trench

    • D. 

      Divergent boundary

  • 17. 
    In order to make a sodium (Na) chlorine (Cl) bond in NaCl,
    • A. 

      One electron is transferred from the sodium atom to the chlorine atom.

    • B. 

      Two electrons are transferred from the chlorine atom to the sodium atom.

    • C. 

      Two electrons are transferred from the sodium atom to the chlorine atom.

    • D. 

      One electron is transferred from the chlorine atom to the sodium atom.

  • 18. 
    Quartz exhibits of what type of bonding?
    • A. 

      Metallic

    • B. 

      Covalent

    • C. 

      Nuclear

    • D. 

      Ionic

  • 19. 
    What does the symbol Na+ represent?
    • A. 

      A sodium cation

    • B. 

      A sodium electron

    • C. 

      A sodium anion

    • D. 

      A sodium proton

  • 20. 
    What is the most common type of bonding in minerals?
    • A. 

      Metallic bonding

    • B. 

      Covalent bonding

    • C. 

      Ionic bonding

    • D. 

      Nuclear bonding

  • 21. 
    What does porphyritic texture imply in an igneous rock?
    • A. 

      That the rock is intrusive

    • B. 

      That the rock is extrusive

    • C. 

      That the rock cooled at different rates as it was formed

    • D. 

      That the rock is pyroclastic in nature

  • 22. 
    Which of the following minerals is least likely to settle to the bottom of a magma chamber?
    • A. 

      Plagioclase feldspar

    • B. 

      Pyroxene

    • C. 

      Olivine

    • D. 

      Quartz

  • 23. 
    What is the origin of the word “felsic” in the context of igneous rock classification?
    • A. 

      Iron and magnesium (Mg)

    • B. 

      Iron (Fe) and silica (SiO2)

    • C. 

      Feldspar and silica

    • D. 

      It means “light” colored.

  • 24. 
     Which of the following lists is in the correct order of DECREASING silica content?
    • A. 

      Gabbro, diorite, granite

    • B. 

      Gabbro, granite, diorite

    • C. 

      Diorite, granite, gabbro

    • D. 

      Granite, diorite, gabbro

  • 25. 
    Which of the following best describes a rhyolite?
    • A. 

      Coarse-grained igneous rock rich in silica

    • B. 

      Coarse-grained igneous rock poor in silica

    • C. 

      Fine-grained igneous rock poor in silica

    • D. 

      Fine-grained igneous rock rich in silica

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