Q:Can EM waves naturally create sonic waves?
For example, could a natural antenna (e.g. a seam of conductive metal or the right kind of rock)receive em radiation and through thermal/mechanical or piezoelectric effects re-emit low-volume sound?
Background: In some esoteric internet rabbit holes the Schumann resonance is mentioned as fundamental to some psycho acoustic effects (including 440vs432 conspiracy theories). As a plot point in my next book, I am considering a subterranean chamber of the right dimensions able amplify harmonics of the Schumann resonance which are naturally generated in the correct geology.
Edit 1: Better fit this community's guidelines. Edit 2: Telluric currents