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Light travels faster. (186,000 miles per second). Sound travels at 750 miles per hour.
Sound is produced through vibrating objects in a medium (material).
The rate of vibration is related to the pitch of the sound. The faster the vibration, the higher the pitch.
Sounds need something to travel through. In space there is no matter; it is completely empty.
Sound travels best through solids.
An echo happens when a sound is reflected or bounces off an object.
The loudness or softness of a sound.
* Sound is produced whenever an objectÂ
   vibrates.
* Sound needs a medium (material) through
   which to travel.
* Sound travels through solids, liquids, orÂ
   gases.
* Sound travels in waves.
* Sound travels faster through solidsÂ
   because the molecules in solids are close
   together.Â
* Sound can reflect from the surface of an
  object creating an echo.
* Pitch is the highness or lowness of theÂ
   sound.
* The pitch of a sound depends on the
   frequency of the vibrations.
* The greater the frequency, the higher the
   pitch; the lower the rate of frequency, the
   lower the pitch.