( ( The seasons ) ( ( are ( caused ( by ( ( the tilt ) ( of ( ( the ( Earth 's ) ) axis ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS seasons)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (NN tilt)) (PP (IN of) (NP (NP (DT the) (NN Earth) (POS 's)) (NNS axis))))))) (. .)))
The seasons are caused by the 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))))))))))) (. .)))