How is thermal energy defined? What are the three ways that thermal energy can be transferred?

Thermal energy means heat energy.

Three ways that thermal energy can be transferred:

Conduction is the transfer of energy from one molecule to another by direct contact.

Convection is the movement of heat by a fluid such as water or air.

Radiation is the transfer of heat by electromagnetic waves.

Explanation:

I learned it when I was in 4th grade.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave