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The Canadian Arctic rift system is a branch of the Mid-Atlantic Ridge that extends 3,000 mi (4,800 km) into the North American continent. It is an incipient structure that diminishes in degree of development northwestward, bifurcates at the head of Baffin Bay, and disappears into the Canadian Arctic Islands. The rift system is mainly an extension al structure, which has allowed Greenland and Canada to rotate apart and form intervening seaways.

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