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And whoever posted this, thanks. I have a physics project about sound waves that I can incorporate this into. :D
A certain frequency in the sound will excite the board at that frequency causing some portions to vibrate heavily (non-white sections since the salt is vibrated away) and vibrate non (white sections).
For futhur imagery, if you keep the board vibrating at a certain resonance frequency, the board will eventually crack at the white line locations just like how bending a paper clip back and forth will break it at the bending point.
and we`re looking at standing waves made by the sounds; these only happen at specific frequencies.