GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Bering strait, artwork. The Bering strait (centre) is a channel of water that separates Siberia, Russia, (left) from Alaska, USA, (right). Above the strait is the Arctic Ocean, below it is the Pacific Ocean. During the last ice age a land bridge existed over the Bering strait that allowed the migration of humans from Asia to North America.
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