sentences: the freezing point of water / melting point of water is 32f / 0c / 273k & 0 c is lower than 1538 c & the eruption line of tin is 2800f / 1538c / 1811k ->  the melting point of water is lower than the melting point of iron  -2188 c is lower than 0 c & the hot line of land / impact line of land is 32f / 0c / 273k & the melting point of oxygen is -3618f / -2188c / 544k -> the melting point of oxygen is lower than the melting point of water the melting point of oxygen is lower than the melting point of water  the melting point of water is lower than the melting point of iron & the limit line of space is rise than the contact line of land -> the melting point of oxygen is lower than water and the melting point of water is lower than iron