( ( ( The ( intersecting points ) ) ( of ( ( the ( waves ' ) ) crests ) ) ) ( ( are ( called ( ( the points ) ( of interference ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (VBG intersecting) (NNS points)) (PP (IN of) (NP (NP (DT the) (NNS waves) (POS ')) (NNS crests)))) (VP (VBP are) (VP (VBN called) (NP (NP (DT the) (NNS points)) (PP (IN of) (NP (NN interference)))))) (. .)))
The intersecting points of the waves' crests are called the points of interference.
(ROOT (S (NP (NP (DT The) (JJ high) (NNS points)) (PP (IN in) (NP (DT a) (JJ transverse) (NN wave)))) (VP (VBP are) (VP (VBN called) (NP (NNS crests)))) (. .)))