This is a drawing of the interior of Uranus.
Click on image for full size
The Structure of Uranus' Interior
There is no surface to the giant planets, only a gradual change from the atmosphere, as shown in this drawing. Therefore the giant planets do not have strict layers, as the earth-like planets do.
Ice begins forming in the atmosphere of Uranus and keeps increasing until there is slush, and then solid ice. There is not much difference between the atmosphere and the ocean on Uranus, unlike the earth, where there is a definite surface between the air and the ocean.
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