Laboratory Manual for Introductory Geology 4e

EXERCISE 14.5
Karst Hazards (continued)
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(d) As the population has grown, some of the lakes have shrunk dramatically, and some have dried up entirely. Suggest
possible reasons for these changes.
The larger lakes are popular for boating and fishing, but residents fear what might happen if one lake became polluted. Like
streams, groundwater flows downhill, so pollutants would migrate from one lake to another. For example, a gasoline spill on any
of the lakes along line A–B in Figure 14.9 could affect the other lakes. The topographic map doesn’t provide enough detail to
tell us the direction in which the pollutants would flow, so we’ll use more modern methods. Using Google Earth, search for Lake
Grandin, FL, and view the chain of lakes along line A–B. Move the cursor to each lake and record the elevation of its surface.
(e) Draw arrows using different colored pencils to show the direction in which pollutants would flow from each of the lakes.
EXERCISE 14.6
A Karst Puzzle
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Carlsbad Caverns National Park in New Mexico (FIG. 14.10) contains spectacular caverns with stalactites, stalagmites,
and columns, yet the area where it is located does not exhibit the karst features found at Mammoth Cave and in northern
Florida. Suggest an explanation. What conditions might be causing caverns to form below ground without a karst topography
above ground?
376 CHAPTER 14 GROUNDWATER AS A LANDSCAPE FORMER AND RESOURCE