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Which windblown soil formation runs along Iowa's western edge, with similar deep deposits found only in China?

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Correct answer: Loess Hills

The Loess Hills rise up to 200 feet above the Missouri River flatlands. They were formed by windblown dust during the last Ice Age. This rare landscape supports unique prairie plant communities that are not found anywhere else in the state. Photo: Bill Whittaker, Wikimedia Commons, CC BY-SA 3.0.

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Source: Wikipedia (CC BY-SA)

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