( ( ( The ( scientific explanation ) ) ( for this ) ) ( ( is ( ( based ( on ( the fact ) ) ) ( that ( scientists ( recently ( learned ( that ( rain ( is ( one ( of ( ( the ( loudest sounds ) ) ( underwater ( in ( the ocean ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ scientific) (NN explanation)) (PP (IN for) (NP (DT this)))) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (DT the) (NN fact))) (SBAR (IN that) (S (NP (NNS scientists)) (ADVP (RB recently)) (VP (VBD learned) (SBAR (IN that) (S (NP (NN rain)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (JJS loudest) (NNS sounds)) (VP (VBN underwater) (PP (IN in) (NP (DT the) (NN ocean))))))))))))))) (. .)))
The scientific explanation for this is based on the fact that scientists recently learned that rain is one of the loudest sounds underwater in the ocean.
(ROOT (S (NP (PDT All) (NP (JJ scientific) (NNS explanations)) (CC and) (NP (NNS interpretations))) (VP (VBN based) (PP (IN on) (NP (NNS facts)))) (. .)))