Assertion: cumulonimbus cloud | /r/HasProperty | rare
Facets:
value: in polar regions
type: LOCATION
Source sentences:
text: Cumulonimbus is rare over the polar regions, and becomes increasingly frequent with decreasing latitude, and is, in fact, an almost regular climax of the diurnal cloud cycle in the humid areas of the tropical regions and in humid and unstable air masses penetrating the temperate latitudes.
text: Cumulonimbus is rare in polar regions and more frequent in temperate and tropical regions.