Which type of wave does the illustration depict.

LONGITUDINAL WAVES

Explanation:

When wave travels through a medium and all its medium molecules will travel in the direction of propagation of wave then this type of energy propagation is known as longitudinal waves.

Here in this type of wave propagation at few positions the medium molecules will come closer and this is known as compression

While at some position the medium molecules will move apart and this is known as rarefaction

So here we can see such movement of the particles in the given picture

so this is a type of

Longitudinal wave

thermal energy is the answer

dang that balls went far