Witch air mass would produce cold, dry weather in the winter

Continental polar air mass

Explanation:

continental polar air masses are very big, very cold, and very dry. These types of air masses are found forming in Siberia and central Canada.

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explanation:

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.