Assertion: national park's water | /r/CapableOf | erode passage
Facets:
value: over time
type: TEMPORAL
Source sentences:
text: Don’t Miss: Two trails—the Balconies Cave Trail on the west and the Bear Gulch Cave Trail on the east—plunge into pitch-black talus caves, narrow canyons that have filled with rockfall ranging from huge boulders to rocky debris; over time, flowing water has eroded passages that hikers can scramble through.