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The National Geophysical Data Center (NGDC) is one of several resources operated by the National Oceanic and Atmospheric Administration, a division of the U.S. Department of Commerce. This organization predominantly deals with geophysical data, which the agency describes as data about "solid earth, marine, and solar-terrestrial environment." It operates more than 300 databases of information for use by private industry, government agencies and the general public.
As part of its operations, the NGDC maintains various kinds of reports on different types of geophysical systems, including aeromagnetic data, topography, information on the Great Lakes area and other major natural resources and natural hazards. Some of these reports detail instances of different kinds of storms, volcanic eruptions, earthquakes and other weather emergencies. Information on comprehensive scientific forces like gravity are also maintained on the NGDC's website.