no
mars is mostly made of rock because it is a rock planet. earth,mercury, and venus are all rock planets
Eris is made of rock and ice.
Pluto is made of rock and ice.
Europa, one of Jupiter's moons, is made of rock and ice.
Uranus is mostly gas by volume, however there is a solid inner core of the planet that is composed of ice and rock.
Jupiter is primarily composed of gas but may have a solid silicate rock and ice core.
Eris is made mostly of ice.
Gas. Jupiter is composed predominantly of hydrogen and helium.
Uranus' surface is made of gas, while the core is made of rock and ice.
Gas but pluto is made out of ice and rock
Nptune is made mostly out of gas
Gas, Menthane, Ice, Water, Ammonia, and Rock