( ( Pillow lava ) ( ( is ( lava ( that ( ( ( has erupted ) and ) ( flows ( beneath ( ( a body ) ( of water ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Pillow) (NNP lava)) (VP (VBZ is) (NP (NP (NN lava)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ has) (VP (VBN erupted))) (CC and) (VP (VBZ flows) (PP (IN beneath) (NP (NP (DT a) (NN body)) (PP (IN of) (NP (NN water))))))))))) (. .)))
Pillow lava is lava that has erupted and flows beneath a body of water.
(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)))) (. .)))