This is a drawing of the interior of Neptune.
Click on image for full size
NASA

The Structure of Neptune's Interior

There is no surface to the giant planets. There is only a gradual change from the atmosphere, as shown in this drawing. Therefore the giant planets do not have layers, as the earth-like planets do.

Ice begins forming in the atmosphere of Neptune and keeps increasing until there is slush, and then solid ice.

There is not much difference between the atmosphere and the ocean, unlike the earth, where there is a surface.


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