( temperatures ( ( ( ( are stable ) or ) ( ( rise slightly ) ( with altitude ) ) ) ; ) )
(ROOT (S (NP (NNS temperatures)) (VP (VP (VBP are) (ADJP (JJ stable))) (CC or) (VP (VBP rise) (ADVP (RB slightly)) (PP (IN with) (NP (NN altitude))))) (: ;)))
temperatures are stable or rise slightly with altitude;
(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)))) (. .)))