This 21-slide powerpoint explains the structure of volcanoes, the causes of eruptions, and the steps of an eruption. Illustrated by many photographs, this powerpoint shows volcanoes around the world. It shows the Mount St. Helens area before and after eruption, as well as the long years of recovery. It ends by discussing the study of volcanoes as a scientific profession.
This is a great science powerpoint. It is also appropriate following the 3rd Grade HM story "Dogzilla" as a science link.