How does convection occur in the troposphere

Convection occurs in the troposphere because This occur as a result of different temperature in air. The surface heated air expands as it warms, becomes less dense than surrounding cooler air and rises as buoyant and turbulent bubbles. This is convection and is the main process by which the troposphere mixes and heats. Although convection stirs and mixes the troposphere, the higher it is the colder it becomes.

im guessing the west of station b