Asked by anonymous
                which substance combines with iron in the presence of water to form rust?
Oxygen
acid
nitrogen
carbon dioxide
            
        Oxygen
acid
nitrogen
carbon dioxide
Answers
                    Answered by
            anonymous
            
    which process is most likely responsible for the formation of limestone caves?
oxidation
abrasion
carbonation
hydrolysis
    
oxidation
abrasion
carbonation
hydrolysis
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