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Sonar Scans Revealed About 40 Huge Craters At The Bottom Of Lake Michigan, And It's Likely That They Are SinkholesIn 2022, researchers were working on a project to map the lakebed inside ... which borders Michigan and Canada. They turned out to be sinkholes. Sinkholes form when groundwater dissolves bedrock ...
Figure 2b shows areas of on-land sinkholes and submerged sinkholes around Alpena, Michigan. Here ... Laboratory for preparing and revising the map of the research site (Figure 2b).
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