This is a schematic of the interior of Neptune.
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An Overview of Neptune's Interior
The Giant planets do not have the same kind of structure inside that the terrestrial planets do. Their evolution was quite different than that of the terrestrial planets, and they have much more gas and ice inside.
Neptune's interior composition is primarily that of methane ice, just as Uranus' is.
Motions in the interior of Neptune contribute to the formation of the magnetosphere of Neptune. Heat generated within Neptune contributes to the unusual strength and motions of the atmosphere.
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