Assertion: coarse sediment | /r/HasProperty | gravel
Facets:
Source sentences:
text: Coarse sediment (gravel and sand) can be viewed as forming the “architecture” of most riverbeds, as the material that constitutes the channel bed, bars, and often banks.
text: Moreover, many geomorphic features that serve as important habitats, such as riffles, are composed of coarse sediments (gravels, cobbles).