( ( ( The reason ) ( for seasons ) ) ( ( is ( ( the tilt ) ( of ( ( the ( Earth 's ) ) axis ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN reason)) (PP (IN for) (NP (NNS seasons)))) (VP (VBZ is) (NP (NP (DT the) (NN tilt)) (PP (IN of) (NP (NP (DT the) (NN Earth) (POS 's)) (NNS axis))))) (. .)))
The reason for seasons is 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))))))))))) (. .)))