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Cascades Volcano Observatory - Learn About Volcanoes: Frequently Asked Volcano Questions
This page provides the answers to frequently asked questions about volcanoes. It is created by the United States Geological Survey. Topics addressed include: What Is A Volcano? Why Do Volcanoes Occur? How Do Volcanoes Erupt? Where Do Volcanoes Occur? When Will A Volcano Erupt? How Hot Is A Volcano? Can Lava Be Diverted? Do Volcanoes Affect Weather? What Types of Volcanoes are There? Which Eruptions Were The Deadliest? 20th Century Volcanic Eruptions and Their Impact. About 60 additional questions with answers are available under MORE FAQ's -Volcano Questions and Answers, and includes some sections on volcanoes of the western United States. Other links to volcano information are also available.
Intended for grade levels:
  • High (9-12)
  • College (13-14)
  • Informal
Type of resource:
  • Text:
    • Ref. material
  • Geological Sciences:
    • Geology
  • Natural hazards
Technical requirements:
No specific technical requirements, just a browser required
Cost / Copyright:
No cost
The maps, graphics, images, and text found on our website, unless stated otherwise, are within the Public Domain. You may download and use them. Credit back to the USGS/Cascades Volcano Observatory is appreciated. If any material is referenced "Image courtesy of ..." or "Information courtesy of ...", etc., then please contact that source for permission for use. To obtain more information about the availability of any images or other government images, please contact our Photo Librarian - David Wieprecht (
DLESE Catalog ID: DLESE-000-000-000-250
Resource contact / Creator / Publisher:
Publisher: United States Geological Survey, David A. Johnston Cascades Volcano Observatory