Watch NASA videos about aerosols and volcanic ash.

Students model Earth's tectonic plate movement and explore the relationship between these movements and different types of volcanoes.

Students examine satellite images of an island before and after a volcanic eruption to determine the impact of the eruption.

In addition to the changes brought about by natural forces, it has recently become apparent that a relative newcomer to planet Earth — the human being — has become a powerful agent of environmental change.