( Volcanoes ( ( are ( associated ( ( ( ( ( ( with ( ( ( convergent boundaries ) , ) ( where ( ( ocean plates ) ( are ( subducted ( under ( ocean ( or ( continental plates ) ) ) ) ) ) ) ) ) ) , ) ( with ( spreading ( ( boundaries , ) ( where ( ( new ( ocean plates ) ) ( are created ) ) ) ) ) ) ) , ) and ) ( with ( hot spots ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Volcanoes)) (VP (VBP are) (VP (VBN associated) (PP (PP (IN with) (NP (NP (JJ convergent) (NNS boundaries)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NN ocean) (NNS plates)) (VP (VBP are) (VP (VBN subducted) (PP (IN under) (NP (NN ocean) (CC or) (JJ continental) (NNS plates))))))))) (, ,) (PP (IN with) (S (VP (VBG spreading) (NP (NP (NNS boundaries)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (JJ new) (NN ocean) (NNS plates)) (VP (VBP are) (VP (VBN created))))))))) (, ,) (CC and) (PP (IN with) (NP (JJ hot) (NNS spots)))))) (. .)))
Volcanoes are associated with convergent boundaries, where ocean plates are subducted under ocean or continental plates, with spreading boundaries, where new ocean plates are created, and with hot spots .
(ROOT (S (NP (DT A) (NN volcano) (NN chain)) (VP (VBZ is) (VP (VBN formed) (PP (IN by) (NP (NP (NN subduction)) (PP (IN of) (NP (JJ oceanic) (NN crust))))) (PP (IN beneath) (NP (DT a) (ADJP (JJ continental) (CC or) (JJ oceanic)) (NN plate))))) (. .)))