Here's why:

* Sound travels through vibrations: Sound waves are vibrations that travel through a medium (like air, water, or solid).

* Density and elasticity matter: The speed of sound depends on how dense the medium is and how easily it can be compressed (its elasticity).

* Solids are more tightly packed: Solids have molecules that are much closer together than those in gases (like air). This means vibrations can be passed along more quickly.

* Elasticity plays a role: Solids tend to be more elastic than gases, meaning they can bounce back to their original shape more readily after being compressed. This also contributes to faster sound transmission.

In general:

* Solids: Sound travels fastest through solids.

* Liquids: Sound travels slower through liquids than solids.

* Gases: Sound travels slowest through gases.

Let me know if you'd like more details about how sound waves work!