Uranus is made mainly from ammonia and methane in the form of ice. It has a core made from liquid ice and other rocky compounds, a mantle made of ammonia, water and other substances, and an outer layer of hydrogen and helium.
The mantle of Uranus is the most prominent layer of the planet. The gases form a dense, hot layer of ammonia, water and other gases. The core of the planet is much smaller than the other layers, and is believed to be a liquid core of icy materials, such as ammonia, water and methane. The core is much cooler than most planets with rocky, molten cores.