Assertion: wave's trough | /r/HasProperty | the lowest point
Facets:
Source sentences:
text: Waves have crests (the peak of the wave) and troughs (the lowest point on the wave).
text: Transverse waves have two parts: a crest, which is the highest point of the wave, and the trough, which is the lowest part of the wave.
text: The crest is the highest point of the wave, and the trough is the lowest point.
text: Trough - the lowest point in the wave.