Question

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earths ice - and snow - covered surfaces above degrees north latitude in and the basin are the source regions of arctic air masses.
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Explanation:

Arctic air masses form over cold, ice - and snow - covered regions. The region above 60 degrees north latitude is typically cold enough for such conditions. The Arctic Ocean is a large body of water in the Arctic region, and the Canadian Arctic Archipelago is a group of islands in the Arctic with ice and snow cover.

Answer:

60; Arctic Ocean; Canadian Arctic Archipelago