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Michigan was once covered by glaciers, which put an enormous amount of weight on the ground, compressing it. With the glaciers gone the ground is rebounding, and the resulting shifts can produce earthquakes. There may also be old faults left over from the formation of the continent or produced by stresses within the North American plate.
striations
Glaciers can produce boulder clay which is the result of glacial abrasion. Boulder clay forms the basis of clay type soils in England.
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Floating Icebergs
Floating Icebergs
rock
Mushrooms containing psilocybin.
Floating Icebergs
By the passing by of a glacier.
Floating Icebergs
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