The correct answer is we don't know. There are novel (to us, anyway) states of iron, for example, that exist at extreme temperatures and pressures that have led scientists to postulate on the possible existence of a crystalized iron core, within the already solid inner core.
The surface is mostly covered in water, but compared the total volume of spherical earth, there's fuck all water.
Was referring to the stuff under the crust as the liquid not the water on top
But how liquid is the molten core? (I assume that's where this poster was going)
The correct answer is we don't know. There are novel (to us, anyway) states of iron, for example, that exist at extreme temperatures and pressures that have led scientists to postulate on the possible existence of a crystalized iron core, within the already solid inner core.