Q: The direction of prevailing winds determines the type of what that usually moves over an area?


Read this paragraph and choose the correct option from the provided answers:

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?.

 Choices:

- storm

- water mass

- weather

- air mass


A:
air mass