Greenland is famous for its massive glaciers, but the region was
relatively free of ice until about 2.7 million years ago, according to a
new study. Before then, the Northern Hemisphere had been mostly
ice-free for more than 500 million years, the researchers said.
The Greenland ice sheet began building after plate tectonics and
the Earth's shifting tilt reshaped the region, the researchers found.
The team narrowed the cause down to three factors: plate
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