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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Media representations of the earth’s interior are horribly misleading.
The earth’s inner core is solid, the outer core is liquid, the mantle – making up most of the rest of the planet is also solid, but flows on geological timescales (think about a finger width per year)
The crust is largely rigid and sits on top. Nothing there would be described well as “roiling”.
Magma is a separate thing, and represents liquid generated by the partial melting of the mantle. It rises up to feed volcanoes. It’s a tiny miniscule proportion of the Earth, and often in very small pockets. That’s not to say we don’t feel it – volcanic earthquakes and deformation on the scale of mm to cm occurs when magma is intruded near the surface.
The mantle is not magma, and does not behave like magma.
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