Use the link below to search a free online database of public domain PDF documents from government websites on topics such as:
Droughts, Earthquakes, Floods, Heat Waves, Hurricanes, Tornados, Volcanoes, etc.
Electronic Archive for the journal Nature from 1869 to the present. Subject Category back to 2010 and Article Category back to 2009.
From earthquakes and volcanoes to the creation of sea-floor crusts and shifting river courses, Earth Revealed offers stunning visuals that explain plate tectonics and other geologic concepts and principles. Follow geologists in the field as they explore the primal forces of the Earth; 26 half-hour video programs to watch at your convenience.