Here's why:

* Particle Density: Solids have particles packed tightly together. This means they can vibrate and transfer energy more efficiently.

* Intermolecular Forces: The strong forces between molecules in solids allow vibrations to propagate quickly.

Here's the general order of speed of sound in different states of matter:

1. Solid: Fastest

2. Liquid: Slower than solids

3. Gas: Slowest