Microsoft and our third-party vendors use cookies to store and access information such as unique IDs to deliver, maintain and improve our services and ads. If you agree, MSN and Microsoft Bing ...

Around 10,000 years ago, as the last Ice Age drew to a close, the drifting of the continent of North America, and spreading ...

During an ice age, the polar regions are cold, there are large differences in temperature from the equator to the pole, and large, continental-size glaciers can cover enormous regions of the earth.