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Geosciences LibreTexts

8.3: Activity 8B - Magma Generation and Plate Tectonics

  • Page ID
    14557
  • The following exercises use the browser version of Google Earth. For each question (or set of questions) paste the given location into the “Search” box. When searching your locations in Google Earth, be sure to zoom out to higher eye elevations in order to see all the important features of each area.

    1. Type 19 53 48.36 N 155 34 58.11 W in the search bar of Google Earth and zoom out to an eye altitude of ~650 miles. Examine this location. Which of the following tectonic features does this island represent?

      1. Subduction

      2. Divergence or rifting

      3. Hot spot

    1. How can you tell?

    1. The melt that formed these volcanic islands was generated by which process?

      1. the decrease of pressure, or decompression melting

      2. the addition of volatiles, commonly water

      3. the increase of temperature only

    1. Type 41 24 38.38 N 122 11 42.58 W in the search bar on Google Earth and zoom out to an eye altitude of ~530 miles. Consider this location. Which of the following tectonic features does this volcano represent?

      1. Subduction

      2. Divergence or rifting

      3. Hot spot

    1. How can you tell?

    1. The magma responsible for this volcano was generated by what process?

      1. the decrease of pressure, or decompression melting, and the addition of heat

      2. the addition of volatiles, commonly water, and the addition of heat

      3. the increase of temperature only

    1. Type San Andreas Fault into the search bar on Google Earth. Can you locate any volcanoes along the trace of the fault? Why or why not?