Niobium and tantalum: indispensable twins [ More info] Explains why these elements are commonly discussed together, how they are used, where we get them, and prospects for future supply and demand.
Nutrients in the Nation's streams and groundwater: National findings and implications [ More info] Despite public sector efforts to reduce nonpoint-source nutrients in streams and rivers, concentrations have remained the same or increased, continuing to pose risks to aquatic life and human health.
Occurrence, distribution, and concentrations of selected contaminants in streambed- and suspended-sediment samples collected in Bexar County, Texas, 2007-09 [ More info] Study showing which chemicals found in sediments were most common, with methods used and likely consequences of their high concentrations.
Periodic table page [ More info] An "image map" periodic table and short notes about many isotopes and their applications to illustrate the uses of assorted isotopes in hydrology, geology, and biology.
Phosphorus and groundwater: Establishing links between agricultural use and transport to streams [ More info] Explains why phosphorus is important, how it moves through the terrestrial water system, how we measure it, and what this means for people who need to manage or monitor human activities that produce it.
Preliminary Assessment of Non-Fuel Mineral Resources of Afghanistan, 2007 [ More info] Estimates of known and undiscovered copper resources total nearly 60 million metric tons of copper. Iron resources in known deposits total 2200 million metric tons of ore. Twenty mineralized areas meriting further study were identified.
Radon in earth, air, and water [ More info] Links to USGS publications, bibliographies, and maps on radon in the U.S., plus links to non-USGS sites with information on radon.
Reservoir sediment studies in Kansas [ More info] Report of completed reservoir sediment studies in Kansas using a combination of bathymetric surveying, sediment coring, chemical analysis, and statistical analysis to understand the quantity and quality of deposited sediment.
Selenium and stable isotopes of carbon and nitrogen in the benthic clam Corbula amurensis from Northern San Francisco Bay, California: May 1995-February 2010 [ More info] Monthly selenium concentration in this keystone species shows strong spatial and seasonal variation in a five-year series of analyses.
The concept of geologic carbon sequestration [ More info] Explains securing carbon dioxide in deep geologic formations to prevent its release to the atmosphere and contribution to global warming as a greenhouse gas.
Alphabetical Index of Topics
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