What is a light wave?
What is a sound wave?
Describe what a medium is.
How do you classify a wave?
The Law of Conservation of mass states: mass is neither created nor destroyed during chemical or physical changes.
The Law of Conservation of Energy states: Energy can be created or destroyed.

What is showing at letter A?
The amplitude of the sound wave or the difference between the compression and rarefaction is...
What is showing at letter B?
What type of wave is this?