What manner of wave inference is demonstrated with this diagram?

Anybody wanna ? (picture included? )

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow