USGS: Science Topics: geochemistry

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Geochemistry

Study of the distribution of chemical elements and natural compounds on the earth and in the atmosphere and the chemical processes that affect the earth.

Subtopics:
Soil chemistry (4 items)
Water chemistry (120 items)

Geochemical anomaly maps (9 items)

Related topics:

Results 11 - 20 of 175 listed by similarity [list alphabetically]

On-line data and reports on acid rain, atmospheric deposition, and precipitation chemistry [More info]: Access to map of data collection sites of the National Atmospheric Deposition Program/National Trends Network (NADP/NTN) with links to other maps and reports on wet atmospheric deposition (chemicals deposited via rain, sleet and snow).
Principal aquifers can contribute radium to sources of drinking water under certain geochemical conditions [More info]: Knowledge of the geochemical processes controlling radium occurrence in groundwater may help water-resource managers anticipate and minimize human exposure to this cancer-causing element.
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.
Response of lake chemistry to atmospheric deposition and climate in selected Class I wilderness areas in the western United States, 1993-2009 [More info]: Sulfate deposition to high-elevation areas has decreased here as a result of reductions in SO2 emissions. Nitrate deposition did not change, whereas ammonium deposition increased, particularly at sites near urban and agricultural areas.
The Alaska Geochemical Database: v. 1.0 - Geologic Materials [More info]: Geochemical analyses of rocks, mineral separates, lake and stream sediment bulk samples, heavy-mineral concentrates, and soils collected by USGS in Alaska from 1962 through 2009.
Understanding our planet through chemistry [More info]: Site with a series of articles showing how chemists and geologists use analytical chemistry to determine the age of the Earth, determine Earth's history, predict volcanic eruptions, observe long-term atmospheric change and study pollution.
Using geochemical and statistical tools to identify irrigated areas that might contain high selenium concentrations in surface water [More info]: Program using pattern recognition analysis and classification models to determine areas of irrigated land with concentrations of selenium.
Acid rain effects on Adirondack streams - results from the 2003-05 western Adirondack stream survey (the WASS Project) [More info]: Acidified soils caused toxic aluminum in 66 percent of 565 assessed streams. Diatoms and aquatic macroinvertebrates were moderately to severely affected. These effects have not improved in areas surveyed in the early 1980s
Acid Rain in Shenandoah National Park, Virginia [More info]: Explains acidity and acid rain and how it affects aquatic organisms. Describes the effect of acid rain on this national park, identifying areas that are at greater or lesser risk from acid rain.
Acute toxicity database [More info]: The following database summarizes the results from aquatic acute toxicity tests conducted by the USGS CERC located in Columbia, Missouri.

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