The answer is Greenland, there was a story were lot's of people lived on Iceland but Iceland was all green, this person found Greenland but it was covered in ice, he called it Greenland to make people come there.
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The origin of the aurora begins on the surface of the sun when solar activity ejects a cloud of gas.
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i would say white because if they were to turn black they would be more visible to predators i believe they have black skin under their fluff .
Hope this helps