( ( The process ) ( ( ( involves diffusion ) ( as ( molecules ( ( migrate ( from ( ( an area ) ( of ( high concentration ) ) ) ) ) ( to ( ( an area ) ( of ( ( low concentration ) ( -LRB- ( ( ( the ( depleted area ) ) ( ( just next ) ( to ( the crystal ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN process)) (VP (VBZ involves) (NP (NN diffusion)) (SBAR (IN as) (S (NP (NNS molecules)) (VP (VB migrate) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJ high) (NN concentration))))) (PP (TO to) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJ low) (NN concentration)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (JJ depleted) (NN area)) (NP (NP (RB just) (JJ next)) (PP (TO to) (NP (DT the) (NN crystal))))) (-RRB- -RRB-)))))))))) (. .)))
The process involves diffusion as molecules migrate from an area of high concentration to an area of low concentration (the depleted area just next to the crystal).
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (NP (NNS molecules)) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJ high) (NN concentration)) (PP (TO to) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJ low) (NN concentration))))))))))))))) (. .)))