Assertion: cumulonimbus cloud's bottom | /r/HasProperty | dense
Facets:
value: quite
type: DEGREE
value: often
type: TEMPORAL
Source sentences:
text: They are tall clouds and are found towering up into the troposphere, whereby their peaks metamorphoses into ice particles, while their bottoms often appear dense and often assume a grayish appearance.
text: They are extremely tall clouds that can be found towering up into the troposphere, where their tops may transmute into ice particles, while their bottoms will appear quite dense, often assuming a grayish cast.