They have an icy composition compared to mercury's rocky composition because they form across frost lines where ice was three to four times more common than metals and rocks. Hydrogen exists on Jupiter as a gas, liquid, and solid.
Composition of Rocky Planets
Terrestrial, telluric, or rocky planets are planets composed primarily of silicate rocks or metals. Within the solar system, the terrestrial planets recognized by the IAU are the inner planets closest to the sun. H. Mercury, Venus, Earth, Mars.
The planets Mercury, Venus, Earth, and Mars are called terrestrial because they have a compact, rocky surface like the mainland Earth. The terrestrial planets are the four innermost planets in the solar system.
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