Shaping the Land

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| image = [[File:Glacial GroovesOHS_AL02982.jpg]]Glacial grooves at Kellys Island shaped by moving glaciers.
<p>During the past two million years, glaciers have shaped and reshaped the surface of Ohio several times. These continental masses of ice affected as much as two-thirds of the state. Moving from the north and northwest, glaciers have scraped and flattened the landscape. Often more than a mile thick, they smoothed existing hills and filled valleys with enormous amounts of rocks, gravel, and smaller particles.</p>