Answer:
Small, made of rocks, made of few moons.
Step-by-step explanation:
The inner planets are also called the terrestrial planets and are mostly rock. These planets are Mercury, Venus, Earth and Mars.
They are made of dense balls of rocks with a few moons. They are believed to have been formed from denser rocky materials that accreted first during the early formation of the solar system.
Outside the terrestrial planets are the gas giants which are mostly made of large masses of gas. The Asteroid belt separates the inner and outer planet from each other.