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    General Geology ... Earth's Stucture and tectonics ... Cartography ... Volcanology ... Petrology ( including mineralology ) ... Paleontology ... Gemology

    General Geology

    United States Geological Survey

    Cartography

    Library of Congress -General Maps

    Explore with Maps

    Altapedia

    Satellite Images of Environmental Change

    Landsat 7 Data Center

    Earth's Structure

    The Interior of the Earth

    Earthquakes

    Current quakes worldwide

    Recent Washington quakes

    Volcanology

    Volcano World - This is a super site dedicated to all Volcanoes

    Volcanoes ( usgs ) -

    Paleontology

    Fossil Links - an extensive and seemingly exhaustive site dedicated to fossils

    PaleoBotany - Plant fossil record

    Gemology

    Gemhut

    Your Gemologist

    Classification of Gemstones

    Lapidary Terms and Techniques