Weather: National Weather Service Floods: NOAA Hydrological Information Center Asteroid impact: NASA Asteroid and Comet Impact Hazards Earthquakes: USGS National Earthquake Information Center Nourished beaches: Duke University Program for the Study of Developed Shorelines Water quality in mining impact studies: Mines, Mining, and the Environment Groundwater movement in proposed nuclear waste site: Inyo County Yucca Mountain Repository Assessment Office Oil and gas resources: USGS Energy Resources program Acid rain: National Acid Precipitation Assessment Program Climate change: U.S. Global Change Research Program