( Occasionally ( ( ( ( ( a seamount ) , ) ( fed ( by ( ( an ( extraordinary volume ) ) ( of magma ) ) ) ) ) , ) ( ( ( ( becomes massive ) and ) ( ( rises ( above ( sea level ) ) ) ( to ( become ( ( an island ) ( such ( as ( ( ( ( ( Iceland , ) ( the Azores ) ) , ) or ) ( the ( Galapagos Archipelago ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Occasionally)) (NP (NP (DT a) (NN seamount)) (, ,) (VP (VBN fed) (PP (IN by) (NP (NP (DT an) (JJ extraordinary) (NN volume)) (PP (IN of) (NP (NN magma)))))) (, ,)) (VP (VP (VBZ becomes) (ADJP (JJ massive))) (CC and) (VP (VBZ rises) (PP (IN above) (NP (NN sea) (NN level))) (S (VP (TO to) (VP (VB become) (NP (NP (DT an) (NN island)) (PP (JJ such) (IN as) (NP (NP (NNP Iceland)) (, ,) (NP (DT the) (NNPS Azores)) (, ,) (CC or) (NP (DT the) (NNP Galapagos) (NNP Archipelago)))))))))) (. .)))
Occasionally a seamount, fed by an extraordinary volume of magma, becomes massive and rises above sea level to become an island such as Iceland, the Azores, or the Galapagos Archipelago.
(ROOT (S (NP (NP (NNS Seamounts)) (SBAR (WHNP (WDT that)) (S (VP (VBP rise) (PP (IN above) (NP (DT the) (NN water) (NN surface))))))) (VP (VBP are) (VP (VBN called) (NP (NNS islands)))) (. .)))