If volcanos are so dangerous, then why do people live near them?
This 44-slide presentation explores how volcanos are harmful to people, but also how they benefit them.
This presentation has lots of great photos and discussion points.
Included are the topics: ash clouds, mudflows (lahars), pyroclastic, tourism, mineral resources, fertile soils, etc.
This presentation can be broken down into two lectures - the first half on the dangers and how they can harm human populations. The second on how they are beneficial.