A terrestrial planets is a planet whose surfaces is usually made of rock and metal. We call it the Inner planets. The Inner planets are a small planet, but this small planet is solid and has a very hot core. The Inner planets core are usually made of metal. These Inner planets are also the 4 planets closest to the sun. These Inner planets also contain volcanoes, craters, mountains and canyons. There are 4 planets that exist in the Terrestrial planets. Terrestrial planets with Jovian planets have one seperation, their name is the asteroid belt that lies between Mars and Jupiter.