Rocks

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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  1. This mineral tends to form first in Bowen's Series:
    1. quartz
    2. plagioclase
    3. olivine
    4. muscovite
    5. biotite
  2. This rock is so porous it often floats on water:
    1. gabbro
    2. obsidian
    3. pumice
    4. granite
    5. rhyolite
  3. Which of these igneous rocks is classified on the basis of its texture:
    1. dunite
    2. andesite
    3. scoria
    4. rhyolite
    5. basalt
  4. This mineral tends to form last in Bowen's Series:
    1. quartz
    2. plagioclase
    3. olivine
    4. muscovite
    5. biotite
  5. All these rocks have about the same chemical composition except:
    1. gabbro
    2. obsidian
    3. pumice
    4. granite
    5. rhyolite
  6. Which is not a common volcanic rock?:
    1. andesite
    2. basalt
    3. gabbro
    4. rhyolite
    5. none of these
  7. Gabbro is coarser grained than basalt because:
    1. it contains more silica
    2. the original magma cooled under low pressure, so that larger crystals could form
    3. the original magma cooled more slowly
    4. the crystals have grown larger during later metamorphism
    5. none of these
  8. Granites and rhyolites are related by:
    1. their grain size
    2. their mode of emplacement
    3. their association in the ocean basins
    4. their mineralogical composition
    5. none of these
  9. The first question a geologist asks in classifying an igneous rock
    1. What feldspars are present?
    2. Is quartz present?
    3. What dark minerals are present?
  10. An igneous rock with large crystals in a fine-grained matrix.
    1. basalt
    2. pumice
    3. scoria
    4. porphyry
  11. According to Bowen's Series:
    1. quartz forms last
    2. quartz and olivine form together
    3. quartz forms before biotite
    4. quartz forms first
  12. Obsidian
    1. is volcanic glass
    2. is usually rhyolitic in composition
    3. has conchoidal fracture
    4. all of the above
  13. What are the two major kinds of igneous rocks:
    1. volcanic and eruptive
    2. volcanic and plutonic
    3. granitic and plutonic
    4. sills and lava
    5. dikes and batholiths
  14. Why is silica the major component of magma?:
    1. it melts at low temperatures
    2. it retains heat well
    3. it dissolves other rocks
    4. it is so abundant
  15. Which of the following pairs of igneous rocks have the same mineral composition?
    1. granite-tuff
    2. basalt-gabbro
    3. andesite-rhyolite
    4. peridotite-andesite
    5. pumice-diorite
  16. Volcanic rocks can usually be distinguished from plutonic rocks by:
    1. color
    2. the size of their mineral grains
    3. composition
    4. specific gravity
    5. iron-magnesium content
  17. When mantle material melts, it usually forms magma of what composition:
    1. basalt
    2. rhyolite
    3. andesite
    4. dunite
  18. The most common intermediate volcanic rock is:
    1. andesite.
    2. basalt
    3. rhyolite
    4. diorite
  19. The most abundant sedimentary rocks are:
    1. limestones
    2. mudrocks
    3. sandstones
    4. arkoses
    5. evaporites
  20. Most limestones have a large component of calcite that was originally extracted from seawater by:
    1. inorganic chemical reactions
    2. chemical weathering
    3. organisms
    4. lithification
    5. evaporation
  21. Dolostone is formed by the addition of _____ to limestone:
    1. calcium
    2. iron
    3. carbonate
    4. sodium
    5. magnesium
  22. The process where dissolved minerals precipitate in the pore spaces of sediment and bind it together is:
    1. compaction
    2. weathering
    3. rounding
    4. cementation
    5. bedding
  23. Coal is
    1. a clastic sedimentary rock
    2. an evaporite
    3. always found with limestone
    4. none of the above
  24. Bedding or stratification in a sedimentary rock
    1. is due to directed pressure from earth forces
    2. results from heat
    3. is always exactly horizontal
    4. represents variations which took place during deposition
  25. What holds a sedimentary rock together?
    1. cement
    2. fossils
    3. water in its pore spaces
    4. silt
  26. Clastic means:
    1. formed by the evaporation of water
    2. formed by living organisms
    3. formed from fragments cemented together
    4. formed from the molten state
  27. The clastic sedimentary rocks are classified primarily on the basis of:
    1. color
    2. grain size
    3. composition
    4. hardness
  28. Deposits of clay become consolidated to form:
    1. limestone
    2. sandstone
    3. shale
    4. evaporite
  29. The single most characteristic feature of sedimentary rocks is:
    1. widely varying grain sizes
    2. made by organisms
    3. the presence of nodules
    4. stratification (bedding)
    5. water-soluble minerals
  30. The rock type that best describes the various types of coal is:
    1. clastic
    2. biochemical
    3. evaporitic
    4. detrital
  31. You would most likely find the remains of plants in a deposit of:
    1. limestone
    2. sandstone
    3. coal
    4. conglomerate
    5. gypsum
  32. Which is most likely to represent a deposit formed on dry land?
    1. Black shale
    2. Red sandstone
    3. Mudrocks
    4. Dolomite
  33. Which would be least likely to indicate a desert environment?:
    1. Sandstone
    2. Coal
    3. Evaporites
    4. Gypsum
  34. Which is most likely to be an evaporite?
    1. Black shale
    2. Rock Salt
    3. Mudrocks
    4. Dolomite
  35. Which indicates the highest metamorphic grade?
    1. epidote
    2. kyanite
    3. chlorite
    4. amphibole
    5. feldspar
  36. A metamorphosed equivalent of a limestone would be a:
    1. dolomite
    2. marble
    3. schist
    4. amphibolite
    5. none of these
  37. Three minerals which are not normally found in sedimentary and igneous rocks are:
    1. quartz, biotite and plagioclase
    2. sillimanite, kyanite and garnet
    3. biotite, muscovite and clay 
    4. garnet, kyanite and feldspar
  38. Gneiss:
    1. shows dark and light bands of minerals
    2. has recrystallized at low temperatures
    3. has good rock cleavage parallel to banding
    4. is very fine-grained
  39. To which metamorphic facies do metamorphic rocks formed under the lowest temperature and pressure conditions belong?
    1. granulite
    2. blueschist
    3. greenschist
    4. eclogite
    5. amphibolite
  40. Which is not a stage in the diagenesis and metamorphism of coal?
    1. anthracite
    2. lignite
    3. diamond
    4. graphite
    5. bituminous
  41. The metamorphic rock formed from limestone is:
    1. quartzite
    2. slate
    3. hornfels
    4. greenstone
    5. marble
  42. From which of the following rock groups can metamorphic rocks form?
    1. plutonic
    2. volcanic
    3. sedimentary
    4. metamorphic
    5. all of these
  43. What is the correct metamorphic sequence of increasingly coarser grain size?
    1. phyllite --> slate --> gneiss --> schist
    2. slate --> phyllite --> schist --> gneiss
    3. gneiss --> phyllite --> slate --> schist
    4. schist --> gneiss --> phyllite --> slate
    5. slate --> schist --> gneiss --> phyllite
  44. An excellent rock for billiard table tops, floor and roofing tiles, and blackboards is:
    1. marble
    2. hornfels
    3. gneiss
    4. slate
    5. phyllite
  45. Diamond and graphite are both made of carbon but have different atomic structures and very different properties. This phenomenon is called:
    1. Isometry
    2. Polymorphism
    3. Multiphasing
    4. Homology

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Created 10 September 2003, Last Update 24 February 2011

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