( ( The wavelength ) ( ( is ( ( the distance ) ( between ( ( two ( adjacent crests ) ) ( of ( a wave ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN wavelength)) (VP (VBZ is) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (NP (CD two) (JJ adjacent) (NNS crests)) (PP (IN of) (NP (DT a) (NN wave))))))) (. .)))
The wavelength is the distance between two adjacent crests of a wave.
(ROOT (S (NP (NNP Wavelength)) (VP (VBZ is) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (NP (CD two) (JJ corresponding) (NNS points)) (PP (IN of) (NP (NP (JJ adjacent) (NNS waves)) (VP (VBN called)))))))) (. .)))
Wavelength is the distance between two corresponding points of adjacent waves called.