A lot of times students start with a broad topic. However, before hitting the books, they should narrow their topic. A general topic can be narrowed...and narrowed topics can be even more specific.
|General topic:||Greensburg, Kansas|
|Narrowed topic:||2007 tornado in Greensburg|
|More specific topic:||rebuilding Greensburg as a "green" community after the 2007 tornado|
Basically, if your topic is only a word or two, or if you have trouble creating a thesis statement, your topic is too narrow.
Use "question words" to help develop topics:
What: 2007 tornado
When: May 2007
How: as a "green" community
Whether this is a "good" topic for your paper depends on how much information is available about it.