• Approximately 30,000 years ago the earth experienced an Ice Age.
• Ice Age – a period of time in which temperatures on earth were very cold, and North America was covered in glaciers.
• Glaciers – large, slow moving sheets of ice
- As the oceans froze, the ocean floor became uncovered and dry.
- The first humans in North America crossed the land bridge.
- Land bridge (Berengia) – an area of land which humans crossed during the Ice Age on their way to North America from Asia.
 
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