Cerean bodies tend to be rather primitive bodies, their surfaces relatively undisturbed since their formation. Subsurface composition tends to be relatively undifferentiated, although there may be a definite core of heavier elements. The surface and upper crustal layers tend to be composed of silicates and carbon.
Cereans are also noted for possessing a reservoir of volatiles. Water and carbon dioxide ice can be found in varying quantities, sometimes to the point where natural sublimation provides a very thin atmosphere. Because of this, Cereans provide attractive shelters for Human habitats, even fuel processing. The presence of these volatiles often have marked surface features impacts. In its youth, the volatiles tend to remain liquid, circulating throughout the crust, and causing the world as a whole to shrink. As the volatiles freeze with age, the Planetoid will expand. The result is a complex series of rifts and blocks, mixing with numerous impact craters, creating a remarkably haunting and chaotic surface morphology.
Some Cerean worlds have extensive smooth regions, caused by ice-erosion early in the body's geologic history. This is very similar to Europan or LithicGelidian worlds.
Occurrence: Cerean worlds are quite common, being found near the "snow line" of a solar system, that region where ices begin to occur in great amounts.
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