List two general differences between inner and outer planets.

Astronomy.

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.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.