Igloos are made of snow. Snow is made of ice. By the transitive property of "made of", igloos are made of ice. As the specific properties of snow are of no rele

Igloos are made of snow. Snow is made of ice. By the transitive property of "made of", igloos are made of ice. As the specific properties of snow are of no relevance to the discussion, saying they are made of ice is entirely reasonable use of language. Your claim is as nonsensical as saying a bottle isn't made of hydrocarbons because it's actually made of plastic. If we were talking about the mechanical properties then "plastic" would be appropriate. But if we were talking about peak oil, "hydrocarbons" would be more appropriate. But both are correct and making the suboptimal choice is merely a matter of style. In this discussion we are talking about melting, so I claim that "ice" is good style. You might think it bad style, but going as far as calling it incorrect makes you factually wrong.