( ( ( The wavelengths ) ( of ( visible light ) ) ) ( ( ( ( extend ( from ( ( ( about 4000 ) A ) ( to ( 7000 A ) ) ) ) ) , ) ( from ( violet ( to red ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS wavelengths)) (PP (IN of) (NP (JJ visible) (NN light)))) (VP (VBP extend) (PP (IN from) (NP (NP (QP (RB about) (CD 4000)) (DT A)) (PP (TO to) (NP (CD 7000) (DT A))))) (, ,) (PP (IN from) (NP (NP (NN violet)) (PP (TO to) (NP (NN red)))))) (. .)))
The wavelengths of visible light extend from about 4000 A to 7000 A, from violet to red.
(ROOT (S (NP (NN Violet) (CC and) (NN red)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (JJ visible) (NN light))))) (. .)))