( ( ( Hydrosphere : ) ( ( The water ) ( ( ( on or ) around ) ( ( the surface ) ( of ( a planet ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Hydrosphere)) (: :) (NP (NP (DT The) (NN water)) (PP (IN on) (CC or) (IN around) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT a) (NN planet)))))) (. .)))
Hydrosphere: The water on or around the surface of a planet.
(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))))))))) (. .)))