1. Go to http://www.google.com
2. Type in causes dark ages (or whatever search terms you need). Press Enter.
3. Read different search results until you find what you need.
4. Re-search with different search terms if you don't find all you need.
what are the causes of dark ages?
2 answers
Hansel, you must learn to do your own searching (or "googling"). The topics you are posting are easily searched, and you need to try.