Can I ask what is the difference betwwen ERODE and CORRODE? I went to China for a three-week holiday not long ago, and someone asked me a question "How come some buildings look so old outside but new inside?" I said "It is caused by acid rain. The surface of the buildings is corroded." Then he asked "Did you mean the paint is eroded?" I am a bit confused here. Can anyone explain the difference of these two words to me, like where should I use them? Thanks.