(S (S (SBAR (IN If) (S (BASENP (DT the) (JJ outermost) (NN layer)) (VP (VBZ cracks) (ADJP (JJ open))))) (COMMA ,) (S (NP (BASENP (DT the) (NN decrease)) (PP (IN in) (NP (BASENP (NN pressure)) (PP (PP (IN from) (BASENP (DT these) (NNS reserves))) (PP (TO to) (BASENP (NN space))))))) (VP (VBZ causes) (S (BASENP (DT a) (NN plume)) (VP (TO to) (VP (VB shoot) (PRT (RP out)))))))) (PERIOD .))