Part 3—Investigate Volcanoes and their Distribution

Step 1 Launch My World and Setup the Project

  1. Launch My World (if necessary).
  2. Make sure you are in Construct mode.
  3. Select Geology from the Data Library pull-down menu.
  4. Click and drag the following layers to your Layer List:
    • Volcanoes
    • *Plate Boundary Types
    • *Continents
  5. * If you are continuing with the same project that you used in Part 2, you only need to add the volcanoes layer and you will need to turn off the Sea-floor age, Lines of Latitude & Longitude, and Plate Boundaries layers.
  6. Switch to Visualize mode by clicking the Visualize tab.

Step 2 Examine the Contents of the Volcanoes Layer

  1. Begin by examining the contents of the Volcanoes layer table.
    • How many volcanoes are listed in the Table of the Layer?

    Histograms are a useful tool when reviewing the information contained in a layer table. A histogram allows you to display the distribution of values for each table attribute or field.

  2. Create a Histogram / Bar Chart for volcano elevation.
    • What is the maximum value for volcano elevations using the statistics at the bottom of the window?
    • What is the average (mean) elevation for all volcanoes worldwide?

  3. Change View Histogram for Field to Primary Type.
    • Which volcano type is the most frequent worldwide?
  4. Close the Histogram / Bar Chart window.

Step 3 Explore the Data between Types of Volcanoes and their Locations on the Continents

  1. From the data in the table you can observe the frequency of Volcano types, next you will examine them on the map.
    • What observations can you make about volcano locations compared to the continents?
    • What visual pattern do you notice in volcano locations?
    • Provide a possible reason why volcanoes occur in these locations.
  2. Use Analyze mode to create specific selections of the location of Stratovolcanoes and Shield volcanoes using the Select by Value feature.
  3. Highlight Mode Tip: After making a selection in Analyze mode, try different Highlight Modes to see different ways to display your selection.
  4. Is there a general difference in the location of Strato vs. Shield volcanoes worldwide?

Step 4 Observe the Relationship between Volcanoes and Plate Boundaries

  1. With the Volcanoes and Plate Boundaries layers on, consider the following questions:
    • What is the pattern of volcano type at divergent vs. convergent boundaries?
    • Does one type of volcano occur more often at a plate boundary than another?
    • Is the pattern of volcanoes similar on both sides of the plate boundary? Explain the pattern you observe.
    • Summary question: For each boundary type, list evidence you've discovered that describes plate movement.