They all have a liquid core.
Uranus and Neptune look very similar.
Uranus is pretty similar to Neptune. They are both ice giants, are roughly the same size, occupy the outer solar system (they are notionally next to each other in 'order') and have significant chemical composition similarities.
There are four gas giants in the Solar System - Jupiter, Saturn, Uranus and Neptune. Yet there is probably countless other gas giants out there.
Jupiter, Saturn, Uranus's, and Neptune.
Jupiter, Saturn, Uranus, and Neptune are the gas giants of our solar system.
The ice giants are Uranus and Neptune. Previously they were classified as gas Giants, but since the voyager flypasts it was noted that they has a completely different structure to the other gas giants (Jupiter and Saturn) Whereas Jupiter and Saturn are composed of mainly hydrogen and helium, Neptune and Uranus are composed of a rocky core surrounded by a "slush puppy" solution of ice and methane.
This would refer to the outer planets; the gas giants. In other words, Jupiter, Saturn, Uranus and Neptune.
Well there are actually only two, Jupiter and Saturn. The other two are more properly called Ice Giants and they are Uranus and Neptune.
Earth is a similar size to Venus (Earth is a bit bigger). Neptune and Uranus are also of a similar size.
Jupiter, Saturn, Uranus, and Neptune are gas giants. They are called that because they are primarily composed of gases like hydrogen, helium, and traces of other elements. These planets have no solid surface and their atmospheres can be thousands of kilometers deep.
Jupiter and Saturn are called gas giants. They are composed primarily of hydrogen and helium, with some water in various physical states. Uranus and Neptune are called ice giants. They are composed of heavier elements and less helium and hydrogen than the gas giants.
Mercury and Venus are terrestrial planets, while Earth is also a terrestrial planet but with unique characteristics that support life. Mars is a terrestrial planet with a thin atmosphere. Jupiter, Saturn, Uranus, and Neptune are gas giants made mostly of hydrogen and helium.