( ( ( The secret ) ( of ( the seasons ) ) ) ( ( is ( ( the ( Earth 's ) ) ( tilted axis ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN secret)) (PP (IN of) (NP (DT the) (NNS seasons)))) (VP (VBZ is) (NP (NP (DT the) (NN Earth) (POS 's)) (JJ tilted) (NNS axis))) (. .)))
The secret of the seasons is the Earth's tilted 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))))))))))) (. .)))