( ( Frost ( ( The formation ) ( of ( ( thin ( ice crystals ) ) ( on ( ( ( the ground ) or ) ( other surfaces ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Frost)) (NP (NP (DT The) (NN formation)) (PP (IN of) (NP (NP (JJ thin) (NN ice) (NNS crystals)) (PP (IN on) (NP (NP (DT the) (NN ground)) (CC or) (NP (JJ other) (NNS surfaces))))))) (. .)))
Frost The formation of thin ice crystals on the ground or other surfaces.
(ROOT (S (NP (NP (DT The) (NN ice) (NNS crystals)) (SBAR (WHNP (WDT that)) (S (VP (VBP form) (PP (IN on) (NP (DT the) (NN ground))))))) (VP (VBP are) (VP (VBN called) (S (ADJP (JJ frost))))) (. .)))