The Great Ice Age thrust down over North America & scoured the present day American Midwest.
问题描述:
The Great Ice Age thrust down over North America & scoured the present day American Midwest.
答
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.