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| prairie pothole marsh
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| Pronunciation: | prAr-E paht-hOL mahrsh |
| Definition : | The whole area from north-central Iowa to central Alberta, Canada, is called the prairie pothole marsh. |
| Facts: |
During the last glacier retreat 12,000 years ago (the Pleistocene epoch), the glaciers left behind depressions (potholes) in the ground. These potholes act as wetlands. |