Planet
A planet is a large, rounded astronomical body that is neither a star nor its remnant.
Geology
As a general rule, bigger terrestrial planets will have a stronger tectonic activity: for the square-cube law, a bigger planet has a smaller surface relatively to its volume, and therefore leaks away less internal heat. It should have a large molten core rich in metals and radioactive elements (which release more heat), a thick mantle and a thin, brittle crust that is easily cracked by mantle convection. A large presence of water in the crust also contributes to tectonic activity, lubricating plates and making rocks more pliable.
Terrestrial
Rocky planets, like Earth.
Jovian
Gaseous planets, AKA, Gas Giants.
Thalassogens
Test
Templates
Terran Planet
Main Article: Terran Planet
Sulfur Planet
A planet with a significant amount of sulfur and its derived compounds.
Chlorine Planet
A planet with a significant amount of chlorine and its derived compounds.