Homework Help: Earth science

Posted by ruby on Wednesday, April 25, 2007 at 12:59pm.

I would like to comfirm that the 4 cycles on Earth are: carbon, water and rock. I think the 4th one is the biosphere but am not sure as the biosphere contains all attributes necessary (including the atmosphere)for life to exist. Am I on the track? I do understand that the advisors are to help and do not do homework. I just need a bit of help.many thanks.

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