he air regulates the temperature across its layers by heat.*1 pointConductionConvectionRadiation

The air regulates the temperature across its layers primarily through the process of Convection.

Here's a step-by-step explanation:

1. Convection is the process by which heat is transferred through the movement of fluids, which in this case is air.

2. When air at the surface of the Earth is heated (by the sun, for example), it expands and becomes less dense than the surrounding cooler air.

3. This less dense, heated air then rises, creating an upward current.

4. As the warm air rises, it cools down and becomes denser, causing it to sink back down.

5. This continuous cycle of rising warm air and sinking cool air creates convection currents, which effectively distribute heat throughout the different layers of the atmosphere.

6. This process of heat transfer via convection is what helps regulate temperature across the different layers of the atmosphere.

Note: While conduction and radiation also play roles in heat transfer within the atmosphere, convection is the primary method by which the air regulates temperature across its layers.