( ( ( The amount ) ( of ( air ( ( that snow ) contains ) ) ) ) ( ( affects ( ( its volume ) ( -LRB- ( ( ( the amount ) ( of ( space ( it ( takes up ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN amount)) (PP (IN of) (NP (NP (NN air)) (SBAR (WHNP (WDT that) (NN snow)) (S (VP (VBZ contains))))))) (VP (VBZ affects) (NP (NP (PRP$ its) (NN volume)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN space)) (SBAR (S (NP (PRP it)) (VP (VBZ takes) (PRT (RP up)))))))) (-RRB- -RRB-)))) (. .)))
The amount of air that snow contains affects its volume (the amount of space it takes up).
(ROOT (S (NP (DT The) (NN term) (NN volume)) (VP (VBZ means) (SBAR (S (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space) (NN matter)))) (VP (VBZ takes) (PRT (RP up)))))) (. .)))