Answer the following question given this paragraph: The direction of prevailing winds determines which type of air mass usually moves over an area. For example, a west wind might bring warm moist air from over an ocean. An east wind might bring cold dry air from over a mountain range. Which wind prevails has a big effect on the climate. What if the prevailing winds are westerlies? The westerlies blow from nearer the Equator to farther from the Equator. How would they affect the climate?. Q: The direction of prevailing winds determines the type of what that usually moves over an area? Choices: - storm - water mass - weather - air mass A:
air mass