Before humans arrived in North America, during earlier Pleistocene ice ages, an ice sheet more than 1-kilometer (0.6 miles) thick jutted into the Arctic Ocean from Siberia.
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Seafloor Scours Hint at Ancient Arctic Ice Sheet
Before humans arrived in North America, during earlier Pleistocene ice ages, an ice sheet more than 1-kilometer (0.6 miles) thick jutted into the Arctic Ocean from Siberia.
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