What substance makes up much of the interior layers of Neptune, marked with an arrow?

Question

Quizplus · Accepted Answer

The substance marked with an arrow is likely to be ice, as much of the interior layers of Neptune are believed to be composed of a mixture of ice, rock, and some form of liquid. While hydrogen and helium are the primary components of the planet's atmosphere, they do not make up much of the planet's interior. Methane is also present in the atmosphere but is not a major component of the planet's interior.

What Substance Makes Up Much of the Interior Layers of Neptune