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The USGS is a science organization that provides impartial information on the health of our ecosystems and environment, the natural hazards that threaten us, the natural resources we rely on, the impacts of climate and land-use change, and the core science systems that help us provide timely, relevant, and useable information.
Sounds of Yellowstone
Sounds of Yellowstone
The USGS Sounds of Yellowstone series lets you listen to the natural sounds of geysers, hot springs, and mudpots found through Yellowstone National Park in Wyoming, USA.
Image of the Week
Image of the Week
A weekly series from the USGS Earth Resources Observation and Science (EROS) Center highlighting satellite image(s) featuring striking changes to the Earth's surface.
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Mauna Loa Volcano Hawaii -- 1930s Eruption (Part 5 of 5)
1923 Survey of the Grand Canyon of the Colorado River in Arizona
The survey of the Grand Canyon of the Colorado River in Arizona. This survey, perhaps the most difficult ever undertaken by government engineers, was made to show the possibilities for development of power. Every feasible dam site was surveyed and the flow of all tributary streams was measured.
The survey of the Grand Canyon of the Colorado River in Arizona. This survey, perhaps the most difficult ever undertaken by government engineers, was made to show the possibilities for development of power. Every feasible dam site was surveyed and the flow of all tributary streams was measured.