Science and Products
New USGS assessment provides fresh insights into nation’s brackish groundwater inventory
USGS provides a long-term look at changes in the quality of our nation’s rivers and streams
Groundwater, which flows out of sight through aquifers beneath our feet, is one of the Nation’s most important natural resources. In recognition of National Groundwater Awareness Week, March 5–11, 2017, here’s an opportunity to put your knowledge of this vital resource to the test!
The new table includes both standard and conventional atomic weights values to clarify that many atomic weights have natural variation and to provide single values for chemical education use
Consistent, national-scale and long-term water-quality monitoring of the Nation's rivers and streams has declined, in some cases, by more than half over time
Challenges remain in combining data from multiple organizations