( ( Ice melting ) ( to ( form water ) ) )
(ROOT (FRAG (NP (NN Ice) (NN melting)) (S (VP (TO to) (VP (VB form) (NP (NN water)))))))
Ice melting to form water
(ROOT (S (NP (NNP Water)) (VP (VBZ takes) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN ice)))) (PP (IN on) (NP (NN planet) (NNS mars)))) (. .)))