( ( As ( altitude increases ) ) ( , ( temperature ( decreases . ) ) ) )
(ROOT (S (PP (IN As) (NP (NN altitude) (NNS increases))) (, ,) (NP (NN temperature)) (VP (VBZ decreases)) (. .)))
As altitude increases, temperature decreases.
(ROOT (S (PP (IN As) (NP (NN altitude) (NNS rises))) (, ,) (NP (DT the) (NN temperature)) (VP (VBZ increases) (PP (IN in) (NP (DT the) (NN thermosphere)))) (. .)))