Assertion: kettle | /r/HasProperty | two pools
Facets:
Source sentences:
text: The Kettles are two pools that are the end result of catastrophic subsidence in 1179: the Permian rocks underlying the area include substantial thicknesses of evaporites—gypsum and gypsiferous mudstone—and subsidence resulting from subterranean dissolution of these beds is a frequent occurrence, though the scale of the Hell Kettles subsidence is exceptional.