( ( The volcano ) ( ( is ( made ( of ( ( ( lava ( ( flows and ) tephra ) ) ( on ( a ( submarine ( ( -LRB- ( ( under water ) -RRB- ) ) base ) ) ) ) ) ( of ( pillow lava ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN volcano)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (NP (NN lava) (NNS flows) (CC and) (NN tephra)) (PP (IN on) (NP (DT a) (JJ submarine) (PRN (-LRB- -LRB-) (PP (IN under) (NP (NN water))) (-RRB- -RRB-)) (NN base))) (PP (IN of) (NP (NN pillow) (NN lava))))))) (. .)))
The volcano is made of lava flows and tephra on a submarine (under water) base of pillow lava.
(ROOT (S (NP (NP (NNP Lava)) (SBAR (WHNP (WDT that)) (S (VP (VBZ enters) (NP (DT the) (NN water)))))) (VP (VBZ is) (VP (VBN called) (NP (NN pillow) (NN lava)))) (. .)))