( Meteorites ( ( are ( highly ( prized ( by ( astronomers ( ( ( interested ( in ( ( the origins ) ( of ( the ( Solar System ) ) ) ) ) ) , ) ( as ( they ( provide ( ( a chance ) ( to ( study ( ( original material ) ( which ( has ( been ( unaltered ( by ( any ( of ( ( the weathering ) ( that ( affects ( rock ( on Earth ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Meteorites)) (VP (VBP are) (ADJP (RB highly) (JJ prized) (PP (IN by) (NP (NP (NNS astronomers)) (VP (VBN interested) (PP (IN in) (NP (NP (DT the) (NNS origins)) (PP (IN of) (NP (DT the) (NNP Solar) (NNP System))))) (, ,) (SBAR (IN as) (S (NP (PRP they)) (VP (VBP provide) (S (NP (DT a) (NN chance)) (VP (TO to) (VP (VB study) (NP (NP (JJ original) (NN material)) (SBAR (WHNP (WDT which)) (S (VP (VBZ has) (VP (VBN been) (ADJP (JJ unaltered) (PP (IN by) (NP (NP (DT any)) (PP (IN of) (NP (NP (DT the) (NN weathering)) (SBAR (WHNP (WDT that)) (S (VP (VBZ affects) (NP (NP (NN rock)) (PP (IN on) (NP (NNP Earth)))))))))))))))))))))))))))) (. .)))
Meteorites are highly prized by astronomers interested in the origins of the Solar System, as they provide a chance to study original material which has been unaltered by any of the weathering that affects rock on Earth.
(ROOT (S (NP (NP (NNS Meteorites)) (, ,) (VP (VBN formed) (PP (IN of) (NP (NN split) (NNS asteroids) (CC or) (NN planetary) (NNS rocks)))) (, ,)) (VP (VBP provide) (NP (NP (NNS clues)) (PP (IN about) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))