( ( The ( Stratosphere ( and ( Ozone Layer ) ) ) ) ( ( Above ( the troposphere ) ) ( ( is ( ( ( the stratosphere ) , ) ( where ( ( air flow ) ( is ( mostly horizontal ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNP Stratosphere) (CC and) (NNP Ozone) (NNP Layer)) (ADVP (IN Above) (NP (DT the) (NN troposphere))) (VP (VBZ is) (NP (NP (DT the) (NN stratosphere)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NN air) (NN flow)) (VP (VBZ is) (ADJP (RB mostly) (JJ horizontal))))))) (. .)))
The Stratosphere and Ozone Layer Above the troposphere is the stratosphere , where air flow is mostly horizontal.
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (NP (DT the) (NN layer)) (PP (IN above) (NP (DT the) (NNP troposphere))))) (. .)))