( Occasionally ( ( this magma ) ( ( will ( ( ( ( ( erupt ( to ( the surface ) ) ) ( through ( some ( ( ( crevice or ) volcanic ) explosion ) ) ) ) and ) rudely ) ( ( remind us ) ( about ( ( exactly where ) ( it ( is ( that ( we ( are ( living on ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Occasionally)) (NP (DT this) (NN magma)) (VP (MD will) (VP (VP (VB erupt) (PP (TO to) (NP (DT the) (NN surface))) (PP (IN through) (NP (DT some) (ADJP (JJ crevice) (CC or) (JJ volcanic)) (NN explosion)))) (CC and) (ADVP (RB rudely)) (VP (VB remind) (NP (PRP us)) (PP (IN about) (SBAR (WHADVP (RB exactly) (WRB where)) (S (NP (PRP it)) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP we)) (VP (VBP are) (VP (VBG living) (PRT (RP on))))))))))))) (. .)))
Occasionally this magma will erupt to the surface through some crevice or volcanic explosion and rudely remind us about exactly where it is that we are living on.
(ROOT (S (NP (NP (DT The) (NN thickness)) (PP (IN of) (NP (NN magma)))) (VP (VBZ determines) (SBAR (IN whether) (S (NP (DT a) (JJ volcanic) (NN eruption)) (VP (MD will) (VP (VB be) (ADJP (JJ explosive))))) (CC or) (RB not))) (. .)))