( ( ( ( ( ( The ( steam 's ) ) vibration ) ( ( produces ( a ( lower density ) ) ) ( than water ) ) ) and ) ( therefore ( it ( floats ( in water ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN steam) (POS 's)) (NN vibration)) (VP (VBZ produces) (NP (DT a) (JJR lower) (NN density)) (PP (IN than) (NP (NN water))))) (CC and) (S (ADVP (RB therefore)) (NP (PRP it)) (VP (VBZ floats) (PP (IN in) (NP (NN water))))) (. .)))
The steam's vibration produces a lower density than water and therefore it floats in water.
(ROOT (S (NP (NNP Density)) (VP (VBZ allows) (SBAR (S (NP (NN cut)) (VP (VBZ logs) (S (VP (TO to) (VP (VB float) (PP (IN on) (NP (NN water)))))))))) (. .)))