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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
Volcanoes
Articles Books Videos Statistics
Online Resources
Wikipedia LiveScience Explore Volcanoes
Science Volcano World Plate Techtonics 
Volcanoes Smithsonian Earth's Structure
Forecasting LiveScience Scientific American
USGS Ready.gov Volcanoes.com
Basic Planet Volcanoes.ca National Geographic
US EPA Encyclopedia Weather Wiz Kids
Sciencing Volcano World ... VolcanoDiscovery