Geology resources
Volcanoes, Volcanoes of the world
Alaska Volcano Observatory
Global tectonics - Natural hazards
Age of Earth - Abundance of radioisotopes in the Earth's crust
Geological time scale at wikipedia - compact diagram
Snowball Earth, Plate tectonics at wikipedia
Lisbon earthquake (Nov 1, 1755)
Old Faithful videocam, Mt. St. Helens Webcam
Mount Merapi, Richat structure
The planet at night, Lake Vostok
Carbon dioxide lake, Lake Nyos