1. By Jillian, Isabel, Jack, and Spencer myspace.com

2.  What is sound?  Technically, sound is vibrations that travel through the air, into our ears, which then sends messages to our brains, which the interprets the vibrations as sound.  There are different types of vibrations, or waves.  Fast, tight waves that we interpret as high sounds.  And slow, far apart vibrations that we think of as low sounds. http://www.spectrum.ieee. org/image/60859

3. dogtraininglab.com http://www.treehugger.com/el ectric-motorcycle-photo-01.jpg http://media.photobuck et.com/image/people% 20playing%20guitars/h ybridweasel/cat- playing-guitar.jpg Dogs make noise when they bark, motorcycles make sounds when you turn them on, and both cats and guitars make loud, wailing noises if you hold them just right.

4.  https://remote.birmingham.k12.mi.us/workpl ace/access/home (You’ll have to scroll down a bit on this one!) https://remote.birmingham.k12.mi.us/workpl ace/access/home  http://faculty.washington.edu/chudler/bigea r.html (So it’s not exactly about sound, but it tells how we hear!) http://faculty.washington.edu/chudler/bigea r.html  http://www.kids-science- experiments.com/sound-vibration-facts.html (Now this is a really god site!) http://www.kids-science- experiments.com/sound-vibration-facts.html