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Mark Havnes | The Salt Lake Tribune Utah high school students competing in the Envirothon Saturday, April 21, 2012, in Zion National Park work at identifying species of aquatic insects on the banks of the Virgin River.
Mark Havnes | The Salt Lake Tribune Utah high school students competing in the Envirothon Saturday, April 21, 2012, in Zion National Park work at identifying species of aquatic insects on the banks of the Virgin River.
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