They get smaller and smaller the farther they go, until at last there is no wave left.
When the wave in the air is large, what kind of sound is made?
It makes a loud sound.
As the wave gets smaller, does the sound grow fainter?
Yes; the smaller the wave the fainter the sound, until at last both the wave and the sound die away.
Where must we be to hear a loud sound?
We must be near the place in which the sound is made.
What kind of waves will make a faint sound?
Small waves in the air make a faint sound.
Will these waves extend as far away as larger ones?