Sound travels through liquids. Sound travels most rapidly through solids. Sounds can be loud or soft. This loudness or softness is its volume. The more energy, the louder the sound.
Sound travels through matter by vibration.
One molecule pushes to the next and so on. We will experiment with sound traveling through matter. We will use paper cups and string to make a string telephone. Have someone say numbers softly into string telephone. The other person will repeat what is heard.