Question

which statement best defines convection?
heat transfer through electromagnetic waves.
heat transfer that occurs only in solid materials.
heat transfer through the movement of particles in a fluid.
heat transfer by direct contact between objects.

Explanation:

Convection is a mode of heat transfer that occurs due to the movement of particles in a fluid (liquid or gas). Heat transfer through electromagnetic waves is radiation. Heat transfer that occurs only in solid materials is conduction (though conduction can also occur in liquids and gases, but it's most prominent in solids in common scenarios). Heat transfer by direct contact between objects is also conduction.

Answer:

Heat transfer through the movement of particles in a fluid.