Assertion: delta's stream | /r/HasProperty | change
Facets:
value: in the base level
type: LOCATION
value: because of tectonic uplift
type: CAUSE
value: because of some other reason
type: CAUSE
Source sentences:
text: A graded stream can become ungraded if there is renewed tectonic uplift, or if there is a change in the base level, either because of tectonic uplift or some other reason.