From the tenth century until around the year 1500, there were Norse settlers living in Greenland. During that time, average yearly temperatures fell slightly worldwide, and some people claim that this temperature drop wiped out the Norse settlements by rendering Greenland too cold for human habitation. But this explanation cannot be correct, time the Norse settlers were there, continued to thrive long after 1500.
What this question is testing
Conclusion
The author rejects the popular explanation that cooling temperatures wiped out the Norse settlements in Greenland.
Evidence
Why? Because another group — the Inuit — was living in the same place at the same time and they did just fine, even after 1500.
Evaluate
The opposing claim was: Greenland got too cold for humans. The author's response: well, then how do you explain the Inuit thriving there? If a place is too cold for humans, no humans should be living there. Inuit humans did. That fact is in direct tension with the temperature explanation.
Think of it like this: someone says "the restaurant closed because the food was inedible," and you respond You've produced a fact that conflicts with the proposed explanation.
Goal
The right answer should describe this technique — offering evidence that contradicts the opposing position.
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