:::Naomi, 

 1. Not every sentence has a citation at the end.  I believe that your information has come from reliable sources, but you have to make sure that on both the submitted assignment on canvas and on the talk page(https://en.wikipedia.org/wiki/Talk:April_2010_Rio_de_Janeiro_floods_and_mudslides) have the citations at the end of each sentence. I noticed that in some places you would cite by doing something like this, (author's last name).  That type of citation is correct for papers, but on Wikipedia, you can insert the citation and it'll come up with a superscript number.  You can practice doing this in your sandbox. 

 2. Your language is not subjective and maintains a neutral tone.  However, I'd suggest taking out some of the direct quotes you used.  Try putting them into your own words.   

 3. You have no unsourced opinions.  As I mentioned before, just make sure you properly cite each sentence.   

 Overall, good job!  I'd just like to say that I don't think you need to put the quote about what mudslides are under the heading "Plate tectonics and Mudslides."  If someone doesn't understand what they are, they can find that information out on the mudslides page.  As for merging the two articles, you should probably shouldn't.  They were two different events and days in history; they can stand for themselves.