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Earth Changes/Seismic Activity Volcano
GeographyVolcano: an Earth land feature in which a mountain like feature develops from the Earths magma that is forced to the surface.
"About 1,900 volcanoes on Earth are considered active, meaning they show some level of activity and are likely to explode again. Many other volcanoes are dormant, showing no current signs of exploding but likely to become active at some point in the future. Others are considered extinct." Read More National Geographic
"Volcanoes are grouped into four types: cinder cones, composite volcanoes, shield volcanoes and lava volcanoes." Read More Weather Wiz Kids
Geography Seismic Activity Disaster Earth Science Glossary
Geography Seismic Activity Disasters  Earth Science Glossary/Images
Online Books
International Handbook Of Earthquake & Engineering Seismology...edited by William H.K Lee, Hiroo Kanamori, Paul Jennings and Carl Kisslinger
Geodetic and Geophysical Effects Associated with Seismic and Volcanic Hazards by Jose Fernandez
Encyclopedia of Earthquakes and Volcanoes by A. E. Gates, D. Ritchie
Online Resources
Wikipedia Volcanoes.ca Explorevolcanoes Volcanoes LiveScience How They Work
Smithsonian Volcano World Volcanoes.com LiveScience.com Scholarly Articles