World's grandest canyon may be hidden beneath Antarctica https://t.co/Ekg32chAPR http://pic.twitter.com/cvTnI7gpo1
— Scientific American (@sciam) January 30, 2016
via Twitter https://twitter.com/sciam
January 31, 2016 at 01:39AM
World's grandest canyon may be hidden beneath Antarctica https://t.co/Ekg32chAPR http://pic.twitter.com/cvTnI7gpo1
— Scientific American (@sciam) January 30, 2016
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