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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The Earth’s mantle is roiling if you’re looking at it on geological timescales, but very slowly in human terms. We’re talking about the flow of what would be, under normal conditions, solid rock (the mantle is not actually liquid, as you may have been taught if you’re not too young), and you might have noticed that your average rock does not flow very fast.
Typical flow rates are on the order of mm or cm per *year*, which is far below the threshold a human could detect.
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