Natural hazards and disasters -- Plate tectonics and physical hazards -- Earthquakes and their causes -- Earthquake predictions, forecasts, and mitigation -- Tsunami -- Volcanoes : tectonic environments and eruptions -- Volcanoes : hazards and mitigation -- Landslides and other downslope movements -- Sinkholes, land subsidence, and swelling soils -- Weather, thunderstorms, and tornadoes -- Climate change -- Streams and flood processes -- Floods and human interactions -- Waves, beaches, and coastal erosion -- Hurricanes and nor'easters -- Wildfires -- Asteroid and comet impacts -- The future : where do we go from here?