Question

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earths ice - and snow - covered surfaces above 60 degrees north latitude in and the basin are the source regions of arctic air masses.
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Explanation:

Arctic air masses originate from cold, ice - and snow - covered regions. In the Northern Hemisphere, above 60 degrees north latitude, Greenland is a large ice - covered landmass, and the Arctic Basin (also known as the Arctic Ocean in this context as it is part of the region contributing to arctic air masses) is also a key source area. These regions are cold enough to be the source of the frigid arctic air masses.

Answer:

Greenland; Arctic