Are all planets rock

Answer 1

No. The four outer planets are not rock. Jupiter and Saturn are what we call gas giants, composed mostly of hydrogen and helium. Uranus and Neptune are sometimes called ice giants, with mantles composed of water, ammonia, and methane ices kept solid by pressure rather than cold. All four of these planets are believed to have rocky cores.

Answer 2

No, not all planets are rock. Some planets, like Jupiter and Saturn, are gas giants made mostly of hydrogen and helium. Other planets, like Neptune and Uranus, are considered ice giants with a composition of water, ammonia, and methane.