Eography as a Natural Barrier to Invasion: Egypt versus Mesopotamia

I would like to have my topic for the research paper be  A compare/contrast paper relating the role/impact of geography and how it either aided or prevented outside attack/invasions in the area of Mesopotamia versus the Nile River Valley.

Topic study includes:

” Relevance of topic to middle school social studies
” Critical analysis
” Web resources and/or graphic elements
” Organization and appropriate use of the conventions of written English