Assertion: alluvial fan | /r/HasProperty | formed at the interface
Facets:
value: between steep hillslopes
type: LOCATION
value: between confined channels
type: LOCATION
value: between flat valleys
type: LOCATION
Source sentences:
text: An alluvial fan is a cone-shaped accumulation of water-deposited sediment, formed at the interface between steep hillslopes and flat valleys where streams exit confined channels.