* Pressure differences: Air moves from areas of high pressure to areas of low pressure. This is the primary driving force behind air mass movement.
* Coriolis effect: The Earth's rotation causes a deflection of moving air masses, which is stronger at higher latitudes. This effect is why air masses tend to curve instead of moving in straight lines.
* Terrain: Mountains and other landforms can influence the direction and speed of air masses.
* Other air masses: Interactions between different air masses can create complex patterns of movement.
Therefore, it's inaccurate to say air masses always move in a certain direction. Their movement is dynamic and influenced by multiple factors.
