PBS
Pbs Learning Media: Anatomy of a Volcano
In this interactive activity from NOVA Online, explore the main features of the Nyiragongo volcano, located in the Democratic Republic of Congo, and learn what risks it poses to the 500,000 people who live in its shadow.
US Geological Survey
U.s. Geological Survey: Quick Reference for Volcano Types
Succinct descriptions of the different kinds of volcanoes, with additional links for each.
Oregon State University
Volcano World: Types of Volcanoes
A reference page describing the different types of volcanoes.