Answer: Jovian (outer) planets are dense, rocky, and small, while terrestrial (inner) planets are gaseous and large.
Explanation:
Nebular theory suggests that sun and planets were formed in Nebula from dust and gases. The molecular cloud of dust and gases in the solar nebula collapsed and started spinning causing the temperature and pressure to rise. The Sun was born at the centered and rest of the material formed a proto-planetary disc from which planets were formed.
Terrestrial planet are rocky planets having metals and silicates formed closer to Sun and Jovian planets are large gaseous planets located beyond the asteroid belt. The debris exists as asteroid belt, Kuiper belt and Oort cloud.
Thus, Jovian (outer) planets are dense, rocky, and small, while terrestrial (inner) planets are gaseous and large. This is a wrong statement which is not required to describe any model of the solar system formation.