Using these maps and your textbook, explain the patterns of average atmospheric pressure over the landmasses. Are the patterns of high and low pressure caused by thermal or dynamic forces?
a) January: __________________________
b) July: __________________________
a) January: Anticyclonic high-pressure systems dominate Northern Hemisphere landmasses.
b) July: Pressures are generally lower than in January as cyclonic systems dominate Northern Hemisphere landmasses.
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