Assertion: dinosaur's fossil | /r/HasProperty | formed
Facets:
Source sentences:
text: Fossils are formed when the remains of an animal (or plant) are covered in sediment.
text: Fossils can also be formed when the remains are broken down completely, leaving only the shape of the animal in the surrounding rock.
text: If all the conditions are right, fossils are formed as the layers of sediment turn into rock.