Concerted effort to monitor, analyze, and record sightings of non-native (introduced) aquatic species throughout the United States. Explains characteristics of the database that is compiled by this program.
Instrument measures elemental abundance and isotopic ratios in samples as small as a few nanograms. Uses include geochronology, geological thermometry, and trace element geochemistry of geological and biological materials.
Homepage for the Toxic Substances Hydrology Program, which provides scientific information on contaminated sites and on human and environmental health. Links to news, topical information, investigations, meetings, publications, and photos.
Homepage for the U.S. Geological Survey, Department of the Interior, serving as portal to all USGS information with search options, USGS in the news, most frequently requested topics, and access to major categories of USGS information.