Jupiter is a gas giant.
It is one of the four gas giant planets.
Earth is a rocky planet.
Titan is a moon of Saturn. It is a rocky moon.
The element mercury is a metal. The planet Mercury is rocky.
The earth is made of rock. It's sometimes called the lithosphere, and litho means rock. A lot of the rock in the middle of the planet is molten, but liquified rock is rock just the same. The earth has an atmosphere, but it is not a "gas planet" in that sense. We look at the structure of the earth in geology and geophysics. And most folks associate geologists with rocks.
Jupiter is a gas giant planet, with no solid surface to stand on (except for it's core) so no it does not have mountains
Jupiter is a gas planet (or a gas giant).
Rock.
It is gas
rock not gas
It is one of the four gas giant planets.
A planet is a large body of rock or gas that orbits a star, such as the sun.
Jupiter is a gas planet, there is no rock there.
Earth is a rocky planet.
Mercury is a rocky planet.
Mars is a terrestrial planet, not a gas giant. Mars is a terrestrial planet because the majority of it is rock, not gas.
Titan is a moon of Saturn. It is a rocky moon.