Part 2—Explore Data Layers

Step 1 Explore Total Annual Precipitation Data

  1. Remain on Investigation III, and click on the Map tab.
  2. Explore the variation in annual precipitation across the U.S. by clicking on different places in the map.
  3. Use the legend below the map to find areas of high and low precipitation.

  4. Question: What regions have the highest precipitation? The lowest?
  5. Answer: Regions with the highest precipitation include: the Pacific Northwest and the Southeast to Gulf Coast.
    Regions with the lowest precipitation include: the Southwest and Eastern Washington/Oregon.

Step 2 Explore Total Annual Evaporation Data

  1. View the Evaporation data by changing the pull-down menu in the layer list from Annual Precipitation to Annual Evaporation.

  2. Notice that the Annual Evaporation map appears and that the color of the map and its associated legend changes to reflect annual evaporation data.

  3. Question: Which color on the Annual Evaporation map represents the highest evaporation and which color represents the lowest?
  4. Answer:The highest evaporation is shown in brown. The lowest evaporation is shown in green.

Step 3 Explore Total Annual Surface Runoff Data

  1. View the Surface Runoff data by changing the pull-down menu in the layer list from Annual Evaporation to Annual Surface Runoff.

  2. Notice that the Annual Surface Runoff map appears and that the color of the map and its associated legend changes to reflect annual surface runoff data.

  3. Question: Which color on the Annual Surface runoff map represents the highest surface runoff and which color represents the lowest?
  4. Answer: The highest surface runoff is shown in purple. The lowest surface runoff is shown in brown.

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