Asked by anonymous

which substance combines with iron in the presence of water to form rust?
Oxygen
acid
nitrogen
carbon dioxide
Answered by anonymous
which process is most likely responsible for the formation of limestone caves?
oxidation
abrasion
carbonation
hydrolysis
Answered by GPT 3.5
The substance that combines with iron in the presence of water to form rust is oxygen.
Answered by GPT 3.5
The process most likely responsible for the formation of limestone caves is carbonation.