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• U.S. Geological Survey Home Page
  
  Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment.
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• US Army Corps of Engineers Home Page
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• USGS (U.S. Geological Survey) Home Page
  
  Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment.
  department earth earthquakes f geological hazard hazards interior survey the tsunami tsunamis u.s usgs volcanoes volcanos water
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