( This ( ( is ( because ( ( as ( rocks weather ) ) ( , ( ( ( the elements ) ( in them ) ) ( ( combine ( with ( ( the ( carbon dioxide ) ) ( in ( the atmosphere ) ) ) ) ) ( to ( create ( ( ( calcium carbonate ) , ) ( which ( gets ( stored ( in ( the oceans ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (SBAR (IN because) (S (SBAR (IN as) (S (NP (NNS rocks)) (VP (VBP weather)))) (, ,) (NP (NP (DT the) (NNS elements)) (PP (IN in) (NP (PRP them)))) (VP (VBP combine) (PP (IN with) (NP (NP (DT the) (NN carbon) (NN dioxide)) (PP (IN in) (NP (DT the) (NN atmosphere))))) (S (VP (TO to) (VP (VB create) (NP (NP (NN calcium) (NN carbonate)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ gets) (VP (VBN stored) (PP (IN in) (NP (DT the) (NNS oceans))))))))))))))) (. .)))
This is because as rocks weather, the elements in them combine with the carbon dioxide in the atmosphere to create calcium carbonate, which gets stored in the oceans.
(ROOT (S (NP (NNP Carbon) (NN dioxide)) (ADVP (RB chemically)) (VP (VBP weather) (NP (NNS rocks)) (PP (IN by) (S (VP (VBG creating) (NP (NNS acids)))))) (. .)))