( ( ( Use ( ( a model ) ( of Earth ) ) ) ( to ( demonstrate ( that ( Earth ( ( rotates ( on ( its axis ) ) ) ( once ( ( every ( 24 hours ) ) ( to ( produce ( the ( night ( and ( day cycle ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Use) (NP (NP (DT a) (NN model)) (PP (IN of) (NP (NNP Earth)))) (S (VP (TO to) (VP (VB demonstrate) (SBAR (IN that) (S (NP (NNP Earth)) (VP (VBZ rotates) (PP (IN on) (NP (PRP$ its) (NNS axis))) (SBAR (IN once) (S (NP (DT every) (CD 24) (NNS hours)) (VP (TO to) (VP (VB produce) (NP (DT the) (NN night) (CC and) (NN day) (NN cycle))))))))))))) (. .)))
Use a model of Earth to demonstrate that Earth rotates on its axis once every 24 hours to produce the night and day cycle.
(ROOT (S (NP (NNP Earth)) (VP (VBZ rotates) (PP (PP (IN on) (NP (PRP$ its) (NNS axis)) (ADVP (RB once))) (CC times) (PP (IN in) (NP (CD one) (NN day))))) (. .)))