vibration

is what causes sound
(shaking-trembling-quivering)


sometimes a phone vibrates

electric chairs vibrate

rubber bands vibrate

a jack hammer vibrates

earthquakes cause vibrations

http://www.youtube.com/watch?v=LfRqoV-bf_c


http://www.learninggamesforkids.com/science_songs/vibration-science-song.html

http://www.sciencekids.co.nz/sciencefacts/sound.html

http://www.kids-science-experiments.com/sound-vibration-facts.html


Interactive
http://resources.woodlands-junior.kent.sch.uk/revision/science/sounds.html

http://www.exploratorium.edu/listen/activities/dean/audio_pong/activity_pong.php


http://www.exploratorium.edu/listen/online_activities.php