* Convection: This is the process of heat transfer through the movement of fluids (liquids and gases). Warmer, less dense fluids rise, while cooler, denser fluids sink. This creates a circular flow that carries heat energy. Imagine boiling water on the stove – the hot water at the bottom rises, while the cooler water at the top sinks, creating a convection current.

* Conduction: While conduction (heat transfer through direct contact) does play a small role in liquids and gases, it's less significant than convection. Conduction is more prominent in solids where particles are tightly packed.

* Radiation: Radiation (heat transfer through electromagnetic waves) is also present in liquids and gases, but again, it's less significant than convection.

In summary: Convection is the dominant mode of heat transfer in liquids and gases because of their ability to move freely, allowing for the creation of those circular currents that carry heat.