( ( Stratosphere-troposphere ( ( exchange and ) convection ) ) ; )
(ROOT (NP (NP (JJ Stratosphere-troposphere) (NN exchange) (CC and) (NN convection)) (: ;)))
Stratosphere-troposphere exchange and convection;
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (NP (DT the) (NN layer)) (PP (IN above) (NP (DT the) (NNP troposphere))))) (. .)))