Why is valley breezes and mountain breezes are considered convection currents?

Valley breezes and mountain breezes are considered convection currents because they result from the differential heating and cooling of the air in these geographic features. During the day, the sun heats the valley or mountain slope, causing the air to rise and create an upslope breeze (valley breeze). At night, the land cools faster than the air, resulting in the air sinking and flowing down the slope (mountain breeze). This cycle of warm air rising and cool air sinking is characteristic of convection currents.