Based on the Bowling For Columbine documentary by Michael Moore, what are some controversial ideas about American society that are explored?
Could you explain what controversial means?
And if you can, name some conventions of a documentary.
Thank you heaps :)

Question

Based on the Bowling For Columbine documentary by Michael Moore, what are some controversial ideas about American society that are explored? 
Could you explain what controversial means?
And if you can, name some conventions of a documentary.
Thank you heaps :)

anonymous · Answer

Controversy is a public debate, an argument, a dispute over opinion. 
So controversial means the subject your talking about it a debatable subject.