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Earthquakes 101 (PDF)
History of Seismology
What are seismic surveys and ho much "shaking" do they create?
Volcanoes can affect the Earth's Climate
Volcano Hazards Fact Sheets
Volcanic Ash and Ashfall
Cascade Volcanoes Simplified Hazards Maps
Lahars move rapidly down valleys like rivers of concrete
How Volcanoes Work
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