What causes valley air to move up surrounding mountains during the day?

Question

The Coriolis Force moves the winds up the sides of hills and mountains.

The valley air is denser because is of its lower elevation.

The Sun warms the air in the valley more than it does the mountains.

The Sun warms the tops of hills and mountains more than it does the valley.

Answer 1

The correct explanation for why valley air moves up surrounding mountains during the day is:

The Sun warms the air in the valley more than it does the mountains.

During the day, the sunlight heats the ground, and as the valley air becomes warmer, it becomes less dense and rises. This process creates a convection current that allows the warmer valley air to ascend the slopes of the surrounding mountains. The air over the mountains may not warm as significantly because they often have a higher altitude and can have more shade from surrounding features, leading to the observed upward movement of the warmer valley air.