Regulatory limits for safe levels of elements in water and foodstuffs are established by the U.S. Environmental Protection Agency and the U. S. Food and Drug Administration.
Learn what the USGS is doing to understand natural hazards and mitigate their effects on human life and property at the USGS Natural Hazards Web site, which h
The USGS Astrogeology Research Program explains that although the USGS has been involved in impact crater research, it is neither the expert facility nor ultimate authori
Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by ground water circulating through them. As the rock dissolves, spaces and caverns develop underground.
The Rocky Mountains are a series of mountain ranges in western North America, including parts of New Mexico, Colorado, Utah, Wyoming, Idaho, and Montana, as well as parts of several provinces in Canada.