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GS Geography Physical Geography of World
Q.

The climate of North America is influenced during winter by the:
Explanation:

ANS. (D) 
Maritime tropical (MT) air masses affecting North America most often originate over the warm water of the Gulf of Mexico, the Caribbean Sea, or the adjacent western Atlantic Ocean. As expected, MT air masses are warm to hot, and they are humid. During winter, when cup air dominates the central and eastern United States, MT air only occasionally enters this part of the country. However, during the summer, MT air masses from the Gulf, Caribbean, and adjacent Atlantic are more common and cover a much wider area of the continent.

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