( ( ( summer ( in ( ( ( the ( Northern Hemisphere ) ) and ) winter ) ) ) ( in ( the ( Southern Hemisphere ) ) ) ) . )
(ROOT (NP (NP (NN summer)) (PP (IN in) (NP (NP (DT the) (NNP Northern) (NNP Hemisphere)) (CC and) (NP (NN winter)))) (PP (IN in) (NP (DT the) (NNP Southern) (NNP Hemisphere))) (. .)))
summer in the Northern Hemisphere and winter in the Southern Hemisphere.
(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 causes) (NP (NN summer)) (S (VP (TO to) (VP (VB be) (VP (VBN warmer) (PP (IN than) (NP (NP (NN winter)) (PP (IN in) (NP (DT the) (JJ northern) (NN hemisphere))))) (SBAR (IN because) (S (NP (NP (DT the) (NNS rays)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBP strike) (NP (DT the) (JJ northern) (NN hemisphere)) (ADVP (ADVP (RBR more) (RB directly)) (PP (IN in) (NP (DT the) (NN summer)))))))))))) (. .)))