File:Glacial Boulder at the Burke Museum. This boulder was naturally polished and grooved by the glaciers that covered the Puget Sound region approximately 13,000 years ago.jpg
DescriptionGlacial Boulder at the Burke Museum. This boulder was naturally polished and grooved by the glaciers that covered the Puget Sound region approximately 13,000 years ago.jpg
English: Glacial Boulder at the Burke Museum. This boulder was naturally polished and grooved by the glaciers that covered the Puget Sound region approximately 13,000 years ago.
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Glacial Boulder at the Burke Museum. This boulder was naturally polished and grooved by the glaciers that covered the Puget Sound region approximately 13,000 years ago.