( Seasons ( ( are ( caused ( ( by ( -LRB- ( A -RRB- ) ) ) ( ( the tilt ) ( of ( ( the ( Earth 's ) ) axis ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNPS Seasons)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (PRN (-LRB- -LRB-) (NP (NNP A)) (-RRB- -RRB-)) (NP (NP (DT the) (NN tilt)) (PP (IN of) (NP (NP (DT the) (NN Earth) (POS 's)) (NNS axis))))))) (. .)))
Seasons are caused by (A) 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))))))))))) (. .)))