12 Archaeological Finds You Won’t Believe Were Found On Earth
one point several hundred thousand years ago, snow began falling over the center of the earth’s largest island. The snow did not melt, and in the years that followed, storms brought even more. All around Greenland, the arctic temperatures remained low enough for the snow to last past spring and summer. It piled up, year after year, century after century, millennium after millennium. Eventually, the snow became the Greenland ice sheet, a blanket of ice so huge that it covered 650,000 square miles and reached a thickness of 10,000 feet in places. Meanwhile, in Antarctica, a similar process was well underway. There, as snow fell upon snow for years without end, the ice sheet spread out over a much vaster area: 5.4 million square miles, an expanse far larger than the lower 48 states. By the start of the modern era, when power plants and electric lights began illuminating the streets of Manhattan, about 75 percent of the world’s freshwater had been frozen into the ice sheets that lay over these lands at opposite ends of the earth.
