A thermally-driven circulation develops because: Group of answer choices in cold, dense air, isobars bunch closer together, while in adjacent warm, less dense air, they spread farther apart. aloft, high pressure develops in cold air regions while low pressure develops in warm air regions. at the surface, high pressure develops in warm air regions while low pressure develops in cold air regions. cold air rises and warm air sinks.

Aloft high pressure develops in cold air regions while low pressure develops in warm air regions

Explanation:

A thermally-driven circulation, or thermals are the movement of warm air that move to a higher level due to the buoyancy forces acting on them. That is due to the difference in densities between the warmed and cool air

Given that pressure = Density, ρ × Gravity, g × Height, h, we have that decrease in pressure (low pressure) is due to low density, therefore, the warm air having low pressure, moves upwards, due to their low density

Therefore, the best option is aloft, (as we move higher), high pressure develops in cold air regions while low pressure develops in warm air regions