Review this page to learn about the background of volcanoes and their eruptions.

The electromagnetic spectrum is comprised of all frequencies of electromagnetic radiation that propagate energy and travel through space in the form of waves. 

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.

Explore the energy and matter cycles found within the Earth System. 

Background information on the El Nino Southern Oscillation or ENSO.