( ( An explosion ) ( ( may ( result ( if ( ( ( the volatiles ) ( in ( the magma ) ) ) ( attain ( ( a pressure ) ( that ( exceeds ( ( the ( confining pressure ) ) ( of ( surrounding ( ( ( liquid and ) solidified ) rock ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN explosion)) (VP (MD may) (VP (VB result) (SBAR (IN if) (S (NP (NP (DT the) (NNS volatiles)) (PP (IN in) (NP (DT the) (NN magma)))) (VP (VB attain) (NP (NP (DT a) (NN pressure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ exceeds) (NP (NP (DT the) (VBG confining) (NN pressure)) (PP (IN of) (S (VP (VBG surrounding) (NP (ADJP (JJ liquid) (CC and) (JJ solidified)) (NN rock))))))))))))))) (. .)))
An explosion may result if the volatiles in the magma attain a pressure that exceeds the confining pressure of surrounding liquid and solidified rock.
(ROOT (S (S (VP (ADVP (RB Continually)) (VBG increasing) (NP (NP (DT the) (NN pressure)) (PP (IN on) (NP (DT the) (NN liquid)))))) (VP (MD will) (ADVP (RB eventually)) (VP (VB cause) (NP (DT the) (NN substance) (S (VP (TO to) (VP (VB solidify))))))) (. .)))