Agree that "rock made weak and ductile under intense heat and pressure" would probably be better than "liquid", but common language and daily experience do not

Agree that "rock made weak and ductile under intense heat and pressure" would probably be better than "liquid", but common language and daily experience do not apply. Whatever the dynamic processes are doing, they must have symmetry and be stable -- hot plumes of stuff don't punch through the contents in random locations.