( Normally ( , ( ( as ( you ( rise ( in altitude ) ) ) ) ( , ( ( the temperature ) ( ( decreases ( due ( to ( ( the changes ) ( in ( air pressure ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (ADVP (RB Normally)) (, ,) (SBAR (IN as) (S (NP (PRP you)) (VP (VBP rise) (PP (IN in) (NP (NN altitude)))))) (, ,) (NP (DT the) (NN temperature)) (VP (VBZ decreases) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (NNS changes)) (PP (IN in) (NP (NN air) (NN pressure))))))) (. .)))
Normally, as you rise in altitude, the temperature decreases due to the changes in air pressure.
(ROOT (S (NP (NNP Air) (NN temperature)) (VP (VBZ changes) (PP (IN as) (NP (NN altitude) (NNS increases)))) (. .)))