What are things that sound waves can travel through?

Sound waves are longitudinal waves. They need a medium to travel through. They cause particles of the medium to vibrate parallel to the direction of wave travel. The vibrations can travel through Solids, Liquids or Gases.

Explanation:

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blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.