Eli5 why can’t we hear/feel the earth’s magma churning away under our feet always?

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The earth is so big, and as I understand, constantly moving and roiling away inside – why isn’t there a constant low level rumble?

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Anonymous 0 Comments

Because like you said, the earth is BIG. The ‘magma layer’ (simplified wording, of course) starts around 200km beneath our feet. That’s over 20 times the height of mount Everest.

Beneath us and magma is 200km of dense rock/sand/water depending on your location, all of which act as sound insulation.

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