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What two things must be present for a wave to form ?

User Eliud
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Waves come in two different kinds, longitudinal and transverse. Longitudinal waves are like of those sounds, consisting of alternating compressions and rarefactions in a medium. Transverse waves are like those on water with the surface going up and down
User Kevin Suchlicki
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Waves come in two kinds, longitudinal and transverse. Transverse waves are like those on water, with the surface going up and down, and longitudinal waves are like of those of sound, consisting of alternating compressions and rarefactions in a medium.
User Ushuz
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