The Great Ice Age thrust down over North America & scoured the present day American Midwest.

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TheGreatIceAgethrustdownoverNorthAmerica&scouredthepresentdayAmericanMidwest.TheGreatIceAgethrustdow

The Great Ice Age thrust down over North America & scoured the present day American Midwest.
The Great Ice Age thrust down over North America & scoured the present day American Midwest.

The Great Ice Age thrust down over North America & scoured the present day American Midwest.
大冰河时代,(巨大的冰川自北极)推进到整个北美,(在冰川的)侵蚀作用下,形成了今天的美国中西部.