The climate of North America is influenced during winter by the

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Q: (SSC/0)
The climate of North America is influenced during winter by the

question_subject: 

Geography

question_exam: 

SSC

stats: 

0,3,16,8,4,4,3

keywords: 

{'polar airmasses': [1, 0, 0, 0], 'tropical airmasses': [1, 0, 0, 0], 'climate': [2, 0, 2, 2], 'warm airmasses': [1, 0, 0, 0], 'winter': [10, 0, 5, 12], 'north america': [10, 2, 9, 9], 'continental': [1, 0, 0, 2]}

During the winter season in North America, the climate is primarily influenced by the presence of tropical airmasses. Tropical airmasses originate from the lower latitudes, closer to the Equator, and are characterized by warm and moist air. These airmasses move northward and bring warmer temperatures to North America during the winter months, tempering the overall climate.

Polar airmasses, on the other hand, originate from higher latitudes and bring cold air with them. However, during winter in North America, the influence of polar airmasses is less pronounced as compared to tropical airmasses because these polar airmasses primarily affect the northernmost regions of the continent.

Warm airmasses and continental airmasses do not have a significant influence on the winter climate of North America.

Correct answer: 4. Tropical airmasses