Technically not all of the elements that exist exist on earth so there are chances that terrestrial planets can be made out of anything. For all we know, there could be a planet made of nothing but...
Terrestial planets in our solar system are: Mercury, Venus Earth and Mars.
Mercury is the smallest planet. Followed by size. Mars, Venus and Earth
The four inner, rocky planets are also known as the terrestrial planets. These are; Mercury, Venus, Earth and Mars.
Mercury,Venus,Earth and Mar, the four closest planets to the sun. The four planets are composed primarily of rock and have solid surfaces.