( ( ( Discuss ( ( the speed ) ( of sound ) ) ) ( through ( different media ) ) ) . )
(ROOT (S (VP (VB Discuss) (NP (NP (DT the) (NN speed)) (PP (IN of) (NP (NN sound)))) (PP (IN through) (NP (JJ different) (NNS media)))) (. .)))
Discuss the speed of sound through different media.
(ROOT (S (NP (JJ Different) (NNS media)) (VP (VBP affect) (NP (NP (DT the) (NN speed)) (PP (IN of) (NP (NN light))))) (. .)))