Answer:
Inner planets are smaller than the outer planets; gas giants have more gravity; Farther apart, inner planets have a solid surface, Inner planets are hotter, inner planets have a shorter period of revolution. Distance from the sun causes these differences.
Explanation:
The four inner planets have slower orbits, slower spin, no rings, and they are made of rock and metal.
The four outer planets have faster orbits and spins, a composition of gases and liquids, numerous moons, and rings.
The outer planets are made of hydrogen and helium, so they are called gas giants.
