( ( ( ( ( In ( the ( solid state ) ) ) ( ( the structure ) ( is open-spaced ) ) ) and ) ( ice ( is ( less ( dense ( than water ) ) ) ) ) ) . )
(ROOT (S (S (PP (IN In) (NP (DT the) (JJ solid) (NN state))) (NP (DT the) (NN structure)) (VP (VBZ is) (ADJP (JJ open-spaced)))) (CC and) (S (NP (NN ice)) (VP (VBZ is) (ADJP (RBR less) (JJ dense) (PP (IN than) (NP (NN water)))))) (. .)))
In the solid state the structure is open-spaced and ice is less dense than water.
(ROOT (S (NP (NNP Ice)) (VP (VBZ is) (NP (NP (DT the) (JJ common) (NN term)) (PP (IN for) (NP (NP (NN water)) (PP (IN in) (NP (PRP$ its) (JJ solid) (NN state))))))) (. .)))