Figure 5. There are many different ways to overcome barriers. Photo showing construction of Hoover Dam bypass bridge in 2010, from the blog of the State Geologist of Arizona, arizonageology.blogspot.com/2010/07/progress-on-hoover-dam-bypass-bridge.html.
Originally uploaded in NAGT:Our Work:Geoscience Education Research:Community Framework for GER:Instructional Strategies.
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