This is a drawing of the interior of Jupiter.
Click on image for full size
NASA
A Look at the Inside of Jupiter
The Giant planets do not have the same kind of layers inside that the earth-like planets do. The history of the giant planets was so different that they formed with much more gas on the inside.
Jupiter is made of the simple molecules hydrogen and helium, and they become liquid in the environment that is found deep inside Jupiter.
Motions inside Jupiter help form the powerful magnetosphere of Jupiter. Heat from within Jupiter contributes to the unusual movements of the atmosphere.
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