Assertion: river | /r/HasProperty | formed
Facets:
value: naturally
type: MANNER
Source sentences:
text: As the amount of water increases and begins to flow faster, the soil begins to erode away and a stream or river is formed.
text: While the river was once free-flowing and frequently flooding, forming alluvial flood plains along its banks, it is currently notable for flowing through a concrete channel on a fixed course, which was built after a series of devastating floods in the early 20th century.
text: A river is a naturally formed body of water that flows on a course.