Final answer:
The Jovian planets, notably Jupiter, Saturn, Uranus, and Neptune, have lower densities, prominent ring systems, and mantles of liquid metallic hydrogen.
Step-by-step explanation:
The Jovian planets are much lower in density, exhibit ring systems and have liquid metallic hydrogen mantles.Jovian planets, which include Jupiter, Saturn, Uranus, and Neptune, are significantly larger than the terrestrial planets and consist mostly of lighter materials such as ices, liquids, and gases. This results in their lower densities compared to the rocky, terrestrial planets like Earth.
The Jovian planets are enveloped by thick atmospheres composed mainly of hydrogen and helium, and feature deep layers of liquid metallic hydrogen within their mantles, particularly in the cases of Jupiter and Saturn. Moreover, all these giant planets have prominent ring systems composed of dust and other particles orbiting them. Jupiter and Saturn, in particular, have extensive mantles of this liquid metallic hydrogen, which is a significant factor in their strong magnetic fields.