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What do you call the time about 20,000 years ago when there was a long period of extreme cold? |
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| What do you call thick sheets of ice? |
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| What is the narrow strip of water called that covers land that connects Asia and North America? |
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| What is the movement of people to the Americas between 40,000 to 10,000 years ago? |
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| What is another word for a possible explanation for an event such as the land bridge allowing people to come to the Americas? |
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| What do you call an item that someone made from the past? |
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