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National Geophysical Data Center (NGDC)
The NGDC provides "geophysical data describing the solid earth, marine, and solar-terrestrial environment, as well as earth observations from space." Browse for material in these areas: bathymetry and global relief, marine geology and geophysics, natural hazards (such as earthquakes, volcanic eruptions, and wildfires), geomagnetic data, earth observations from space, and space weather and solar events. Also includes educational resources such as a climate timeline. From the National Oceanic and Atmospheric Administration (NOAA).
http://www.ngdc.noaa.gov/ngdc.html

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