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Natural Hazards: Tsunami, Earthquake, Volcano, Geothermal http://www.ngdc.noaa.gov/hazard
Geomagnetism, Magnetic Models, Declination Calculators http://www.ngdc.noaa.gov/geomag
Gravity http://www.ngdc.noaa.gov/mgg/gravity
Topography http://www.ngdc.noaa.gov/mgg/topo
World Data Center for Solid Earth Geophysics http://www.ngdc.noaa.gov/geomag/wdc
Ecosystems Informatics, Soils, Groundcover http://www.ngdc.noaa.gov/ecosys