What a fascinating topic! I have just discovered (on Twitter) that Indonesia has very recently changed legislation to cut the red tape currently needed for harnessing energy from volcanoes. Read this article about geothermal energy, how it is harnessed and how earthquakes surprisingly help geothermal plants.
From this article, students would be able to brainstorm many inquiry based questions around a topic which appeals to students of all ages.

Geothermal plant in Iceland
source: http://www.photoree.com/photos/permalink/5824949-42244487@N04