After reading the "Constructing Nature" essay and discovering that Niagara Falls is actually altered very much by humans (i.e. the diversion of water in order to make the falls seem more majestic), I found myself wondering how humans shaped other supposedly "natural" national parks. In my research, I found articles about the purposeful and periodic flooding of the Grand Canyon, which is said to build up sandbars that assist the ecosystems. Here's one article about it:
http://www.msnbc.msn.com/id/23482781/ns/us_news-environment/t/feds-release-flood-grand-canyon/#.T_nIP_nieSo
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