Although the last major ice sheets receded 10,000 years ago, pollen and tree ring data exist to indicate that since 6,000 years ago, there have been small glacial advances and retreats.

Name: Although the last major ice sheets receded 10,000 years ago, pollen and tree ring data exist to indicate that since 6,000 years ago, there have been small glacial advances and retreats.
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Pollen and tree ring data indicate that there have been small glacial advances and retreats since 6,000 years ago.

Although the Last Major Ice Sheets Receded 10,000 Years Ago