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Geosciences LibreTexts

9.3: Lab Exercise (Part A)

  • Page ID
    5621
  • Part A - Magma Generation and Plate Tectonics

    Refer to Figure 9.4 to help answer the questions. The exercises that follow the use of Google Earth. For each question (or set of questions) paste the location that is given into the “Search” box. When finding your locations in Google Earth, be sure to zoom out to higher eye elevations in order to see all of the important features of each area.

    1. Type 19 53 48.36 N 155 34 58.11 W in the search bar on Google Earth, and zoom out to an eye altitude of ~615 miles. The magma that resulted in the formation of these islands was generated by what process?

    a. decreased pressure (arrow “b”)

    b. the addition of water (arrow “d”, which shifts the solidus to the left)

    c. increased temperature (arrow “a”)

     

    2. Type 50 16 27.25 N 29 22 05.11 W in the search bar on Google Earth, and zoom out to an eye altitude of ~2663 miles. The magma generated at this location is due to:

    a. decreased pressure (arrow “b”)

    b. the addition of water (arrow “d”, which shifts the solidus to the left)

    c. increased temperature (arrow “a”)

     

    3. Type 36 11 46.85 S 71 09 48.03 W in the search bar on Google Earth, and zoom out to an eye altitude of ~ 2865 miles. The magma responsible for this volcano was generated by what process?

    a. decreased pressure (arrow “b”)

    b. the addition of water (arrow “d”, which shifts the solidus to the left)

    c. increased temperature (arrow “a”)

     

    4. Type “San Andreas Fault” in the search bar on Google Earth; no magma is generated here, because this plate boundary is _____________________.

    a. a divergent plate boundary, with decompression melting occurs

    b. a convergent plate boundary, where water lowers the melting temperature of rock

    c. a transform plate boundary, where no magma is produced