Oscillation - Something that moves backwards and forwards., Vibration - Backwards and forwards motion of the parts of a liquid or solid., Energy - Energy is needed to make things happen, Sound - A series of compressions and rarefactions that move through a medium, Amplitude - The distance from the middle to the top or bottom of a wave., Frequency - The number of complete waves or vibration produced in one second (measured in Hertz)., Wavelength - The distance between two identical points on the wave, Peak - The top of a wave, Trough - The bottom of a wave., Transverse - The vibrations are at right angles to the direction the waves moves, Longitudinal - A wave where the vibrations are in the same direction as the direction the wave moves., Pitch - A property of sound determined by its frequency, Compression - The part of a longitudinal wave where the air particles are close together, Rarefaction - The part of a longitudinal wave where the air particles are spread out., Reflection  - The change in direction of a ray or wave as a result of its change in speed, Incident wave - The wave coming from a source, Reflected wave - The wave that is reflected from a surface, Vacuum​ - A space in which there is no matter, Speed of light - The distance light travels in one second (300 million m/s), Speed of sound - The distance sound travels in one second (330m/s),  Echo - A reflection of a sound wave by an object,

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