( It ( ( floats ( in ( ( salt water ) ( of ( density ( 1020 ( kg.m -3 ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ floats) (PP (IN in) (NP (NP (NN salt) (NN water)) (PP (IN of) (NP (NN density) (CD 1020) (NN kg.m) (CD -3)))))) (. .)))
It floats in salt water of density 1020 kg.m -3 .
(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)))))))))) (. .)))