( ( The seasons ) ( ( are ( caused ( by ( ( the tilt ) ( of ( ( the axis ) ( of ( the earth ) ) ) ) ) ) ) ) . ) )
(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) (NNS axis)) (PP (IN of) (NP (DT the) (NN earth))))))))) (. .)))
The seasons are caused by the tilt of the axis of the earth.
(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))))))))))) (. .)))