Here's why:

* Rocky Core: Uranus has a solid, rocky core at its center.

* Icy Mantle: Surrounding the core is a thick mantle made up of water, methane, and ammonia ices.

* Gaseous Atmosphere: Above the mantle, Uranus has a thick atmosphere mostly composed of hydrogen and helium.

While other planets have some icy components, Uranus's composition is particularly rich in ices.