Jupiter's moons Io, Europa, and Ganymede have silicate mantles. Io's mantle is 1100 km thick. Ganymede's mantle is 1315 km thick. Europa's mantle is 1165 km thick. The silicate mantle of the Moon is approximately 1300–1400 km thick. Titan and Triton each have a mantle made of ice or other solid volatile substances.