( ( ( the hydrosphere ) ( -LRB- ( ( ( ( ( all water ) surfaces ) or ) ( ( ( about 70 ) % ) ( of ( earth surface ) ) ) ) -RRB- ) ) ) ; )
(ROOT (NP (NP (DT the) (NN hydrosphere)) (PRN (-LRB- -LRB-) (NP (NP (NP (DT all) (NN water)) (NP (NNS surfaces))) (CC or) (NP (NP (QP (RB about) (CD 70)) (NN %)) (PP (IN of) (NP (NN earth) (NN surface))))) (-RRB- -RRB-)) (: ;)))
the hydrosphere (all water surfaces or about 70% of earth surface);
(ROOT (S (NP (NP (DT The) (NN surface)) (PP (IN of) (NP (NN earth)))) (VP (VBZ is) (VP (VBN covered) (PP (IN by) (NP (NP (DT a) (ADJP (RB relatively) (JJ thin)) (NN layer)) (PP (IN of) (NP (NP (NN water)) (VP (VBN called) (NP (DT the) (NN hydrosphere))))))))) (. .)))