1. Density: Denser materials have molecules packed closer together, allowing sound vibrations to transfer more quickly. Think of a tightly packed crowd - a push at one end travels quickly to the other.

2. Elasticity: Elastic materials resist deformation and quickly return to their original shape after being disturbed. This "springiness" allows sound vibrations to propagate efficiently.

3. Temperature: As temperature increases, molecules move faster, leading to more frequent collisions and faster transmission of sound vibrations.

Let me know if you'd like a more detailed explanation of how each property affects sound speed!