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K12 LibreTexts

4.11: Earth's Minerals and Rocks- Challenge 2

  • Page ID
  • 1. A metamorphic rock forms from other rocks that are exposed to increased ___ and ___.
    temperature; pressure.
    2. When describing the texture of a rock or mineral, which features should be examined?
    Size, shape, and the arrangement of mineral grains
    3. Two different rocks must always differ in their ___.
    composition and/or texture
    4. Changes in ___ and ___ result in the formation of metamorphic rocks.
    temperature; pressure
    5. Sedimentary rocks are made up of ___.
    pieces of other rocks that have cemented together
    6. Which type of rock often contains fossils?
    7. Although both these types of igneous rock cool from magma, the composition of ___ rock is higher in iron and magnesium, while that of ___ rock is higher in aluminum, sodium, and silica.
    mafic; felsic
    8. ___ indicates the temperature at which minerals melt or crystallize.
    Bowen's Reaction Series
    9. Different ___ have different compositions and contain whichever elements and gases that were in the rocks that melted.
    10. If a rock has many holes from gas bubbles, it is ___.
    a vesicular rock
    11. Large mountain ranges consisting of intrusive igneous rocks form when ___.
    magma cools deep in the crust and then the resulting plutons are uplifted
    12. Extrusive igneous rocks are also called ___ rocks.
    13. Which type of igneous rock is light in color?
    14. Which type of igneous rock is dark in color?
    15. ___ have very low silica content but high iron and magnesium content.
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