( ( ( ( stratosphere layer ) ( of ( the atmosphere ) ) ) ( above ( the troposphere ) ) ) . )
(ROOT (NP (NP (NN stratosphere) (NN layer)) (PP (IN of) (NP (DT the) (NN atmosphere))) (PP (IN above) (NP (DT the) (NNP troposphere))) (. .)))
stratosphere layer of the atmosphere above the troposphere.
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (DT the) (NN heat) (NN source))) (. .)))