Transfer energy without transferring matter
Wave
The highest point or peak of a wave
Crest
The lowest point or Valley have a wave
Trough
The distance from the resting point to the crest of the wave
Amplitude
The distance from the crest to crest or Trough to trough in wave
Wave length
The number of waves that pass a given point in a set period of time
Frequency
Time for a complete cycle to pass a given point
Period
Matter through which a Mechanical wave travels 
Medium
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