Why is it unlikely that many new hydroelectric dams will be built in the U.S. in the future? What will be an ideal response?
The main reasons are that dams have already been built on the most favorable sites, the cost of land
and environmental considerations. Environmental considerations include changing a natural ecological
system into one that must be managed, displacement of people and dam failures
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Using the graph below, construct a topographic profile from Point “A” to Point “B.” Plot the index contours, as well as the crest and bottom of the fault scarps. The vertical exaggeration of the profile is approximately 6.7x.
The question is based on the “Mt. Dome, California” quadrangle (Map T-24; enlarged to scale 1:48,000; contour interval 40 feet). Three prominent fault scarps can be seen running north to south across the map, and will be referred to as the “western” fault, the “central” fault, and the “eastern” fault. These faults scarps are the result of normal faulting. Figure 36-5 is a stereogram of the same region (in Figure 36-5, north is to the left side of the page). Hint: Because the contour lines are very close together, it may be difficult to discern the elevation of the top and bottom of a scarp. To determine these elevations, find an index contour in the gently sloping area between two scarps, and then count the number of contour lines to the top or bottom of a scarp.
Which of the following factors helps prevent the growth of harmful algal blooms (HABs)?
Large concentrations of Canada Geese Maintaining native plants along waterways Manure runoff from livestock areas Runoff of lawn and crop fertilizers
Which of the following minerals contain double chains of silicon-oxygen tetrahedra in their structure?
a) amphiboles b) feldspars c) olivines d) pyroxenes e) micas (biotite, muscovite, etc.)
Scientists expect human-enhanced global warming to do all of the following except
a. alter precipitation patterns b. shift areas where we can grow crops c. raise average sea levels d. lower sea levels e. shift areas where plants and animals can be found