= Solution
A qualitative sketch has <molecular hydrogen>/<helium> outside, increasing <pressure> into a conducting metallic-hydrogen-rich interior, and centrally enhanced heavy elements, possibly distributed rather than confined to a sharp solid core. Saturn's lower <mass> produces different <pressure>/<temperature> transitions and a larger relative role for central concentration. Both can have compositional <Gradient>[gradients] and <helium> separation; the moment alone does not decide whether any boundary is sharp.
\Image[/past-exam-of-the-short-options-paper-shared-by-prelims-and-parts-a-and-b-of-the-physics-course-of-the-university-of-oxford/2016-planetary-mass-distribution.png]
{title=Moment-of-inertia benchmarks and qualitative giant-planet interior structures}
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