| 11. | Maritime tropical air masses are sometimes referred to as trade air masses.
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| 12. | Life moves more slowly in those cold, moist air masses, I guess.
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| 13. | Polar air masses are kept to the north, resulting in milder winters.
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| 14. | The surrounding mountains act as an effective barrier to moist air masses.
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| 15. | The center of an arctic air mass will be crested over Illinois.
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| 16. | Arctic air masses can act as a barrier to major snow storms.
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| 17. | Continental polar air masses that affect North America form over interior Canada.
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| 18. | Maritime tropical air masses are sometimes referred to as trade air masses.
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| 19. | In attendance at an open-air Mass were members of a rescue brigade.
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| 20. | Temperatures in the sultry air mass will only be slightly above normal.
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