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Cold Water Spring State Preserve: Cave, Winneshiek County, Iowa, Upper Iowa River, Oxygen, Carbon dioxide
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Dieser Artikel gilt, aufgrund seiner Grösse, beim Versand als 2 Artikel!
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| Please note that the content of this book primarily consists of articles
available from Wikipedia or other free sources online. Cold Water Spring
State Preserve is a 60-acre parcel state preserve protecting a spring
that issues from Cold Water Cave, an extensive cave system in Winneshiek
County, Iowa and Fillmore County, Minnesota. The spring is a tributary
of the Upper Iowa River. The cave system contains a large underground
creek that courses around much of the cave's nearly 16 miles of
passages. The cave system has some unusual features such as its rate of
expansion, which is higher than that of most caves. It also has
relatively low amounts of oxygen and high amounts of carbon dioxide. The
cave is a National Natural Landmark, designated in 1987. |
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i.d.R. innert 7-14 Tagen versandfertig
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