3. Pull Up Questions How is it used? Where does it come from? What are some real world examples? What are the advantages and disadvantages?

4. Sound energy is a wave of vibrations. Sound can travel in different speeds. Sound waves require some kind of material to travel through. Sound is slower than light.

5. -Sound travels at 340m per second. -Sound waves change according to the speed and size of the vibrations. -Sound reflects off some materials.This is called an echo.

6. -Sound waves can not be seen. We can't see pressure waves. -Sometimes sound can break glass. -Sound can't travel through a vacum. -The sound of a whale song can travel 800km.

7. -Sound is made of particles. -Your eardrum vibrates when ever you hear sound. -Sound is a machanical wave. -Sound can travel through a solid,liquid,or gas.

8. -Noise is another word for sound. -One use for sound is hearing when things are happening. -Sound travels through molecules. -There are no molecules in space.

9. -Molecules carry sound by bumping into each other. -Sound travel through any thing with molecules. -Sound is a vabration.

10. Resources www.answers.com www.prisci.gold.ac.uk www.soundenergy.com www.wikipedia.org http://science.hq.nasa.gov/kids/imagers/ems/wave s.html