( ( ( Transient ( -LRB- ( short-lived -RRB- ) ) ) ( ( rising ( deep ( mantle plumes ) ) ) ( causing ( flood basalts ) ) ) ) ( ( ( are not ) credible ) . ) )
(ROOT (S (NP (NP (NP (NNP Transient)) (PRN (-LRB- -LRB-) (ADJP (JJ short-lived)) (-RRB- -RRB-))) (VP (VBG rising) (NP (JJ deep) (NN mantle) (NNS plumes)) (S (VP (VBG causing) (NP (NN flood) (NNS basalts)))))) (VP (VBP are) (RB not) (ADJP (JJ credible))) (. .)))
Transient (short-lived) rising deep mantle plumes causing flood basalts are not credible.
(ROOT (S (NP (NNS Rises)) (ADVP (RB then)) (VP (ADVP (RB sinks)) (VBZ does) (NP (NP (JJR deeper) (NN material) (NN cause) (NN convection)) (PP (IN in) (NP (DT the) (NN mantle))))) (. .)))