Assertion: bedrock river | /r/MadeOf | alluvium
Facets:
value: on their beds
type: LOCATION
value: very often
type: DEGREE
Source sentences:
text: Bedrock rivers very often contain alluvium on their beds; this material is important in eroding and sculpting the channel.
text: Bedrock rivers very often contain alluvium on their beds; this material is important in eroding and sculpting the channel.