How might the 1983 Thistle landslide have been prevented?
A) removal of the vegetation that added mass to the hillslope
B) rerouting of the highway that crossed the slide mass
C) construction of retaining walls at the foot of the slope
D) examination of landslide history and installation of drains
D
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A) ATP B) CTP C) GTP D) UTP
What do workers in countries with cheap labor use to recover valuable metals from e-waste?
A. Lead B. Sharp knives C. Heat D. Acid E. Mercury
Discuss some of the uncertainties around global warming
What will be an ideal response?
Approximately what percent of the U.S. population derives a portion of its fresh water from groundwater sources?
A) 10 percent B) 30 percent C) 50 percent D) 90 percent