What is the Schumann Resonance, which some theories link to neurological disturbance during severe magnetic shifts?

Answer

Earth's baseline electromagnetic frequency, often cited around 7.83 Hz.

The Schumann Resonance is described as the Earth's baseline electromagnetic frequency, existing in the extremely low frequency (ELF) range, often cited around 7.83 Hz.

What is the Schumann Resonance, which some theories link to neurological disturbance during severe magnetic shifts?
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