( ( ( The seasons ) ( of ( the year ) ) ) ( ( are ( caused ( by ( ( the ( 23.5 tilt ) ) ( of ( ( the ( earth 's ) ) axis ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS seasons)) (PP (IN of) (NP (DT the) (NN year)))) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (CD 23.5) (NN tilt)) (PP (IN of) (NP (NP (DT the) (NN earth) (POS 's)) (NNS axis))))))) (. .)))
The seasons of the year are caused by the 23.5 tilt of the earth's axis.
(ROOT (S (NP (NP (DT The) (NN tilt)) (PP (IN of) (NP (NP (NN earth)) (PP (IN on) (NP (PRP$ its) (NNS axis)))))) (VP (VBZ is) (NP (NP (CD one) (NN factor)) (SBAR (WHNP (WDT that)) (S (VP (VBZ contributes) (PP (TO to) (NP (NP (NNS seasons)) (VP (VBG occurring) (PP (IN in) (NP (JJ new) (NN york) (NN state))))))))))) (. .)))