Geology

Shield Volcanoes
This is a free online volcano database, with information about all the currently known volcanoes. Every volcano features the basic statistics, as well as a very detailed map, with bot urban and satellite photos, and a google earth placeholder.
http://volcanodb.com/

Geometrics.com
Geometrics' line of seismographs, magnetometers and resistivity instruments lets you produce detailed reports, graphs and maps of the earth's subsurface.
http://www.geometrics.com

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