 Re: how to combine the two sentences?
You are very close! The only problem is that you used the word "of" twice. You can fix it by taking out one "of":
1 (Formal) - "Lava is made of silica, the same material of which sand and glass are composed."
2 (Informal) - "Lava is made of silica, the same material which sand and glass are composed of."
Both formal and informal sentences are fine, but the formal sentence is more widely accepted as correct. It would also be correct to take out the word "same":
3- "Lava is made of silica, the material of which sand and glass are composed."
Last edited by grammar.gal; 12-Sep-2005 at 04:35.
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