Assertion: canyon | /r/HasProperty | carved by wearing activity of rivers
Facets:
value: because of their natural tendency
type: CAUSE
value: generally
type: MANNER
Source sentences:
text: Canyons or gorges are deep ravines between cliffs or mountain peaks, generally carved by the wearing activity of rivers, because of their natural tendency to cut through the surface upon which they flow, thus eroding the underlying layers of rocks.