The Great lakes went through glaciation many thousands of years
ago.
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Precipitation is rain, sleet,hail,snow,etc. and glaciation is
the state of being covered in ice masses and snow basically
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The presence of large ice sheets covering extensive land areas would be likely in a region of continental glaciation. This type of glaciation is characterized by vast ice sheets that spread over entire continents, unlike valley glaciation which occurs in mountain valleys and is more localized in scope.