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Yellow Creek near Oak Grove, IN - Winter

USGS Hydrologic technician Sarah Davis measuring streamflow at the South Fork Grand River near Cash, SD (streamgage 06356500) on January 31, 2019.  Measuring the streamflow under ice requires drilling holes across the width of the stream and then collecting data from each hole.  At times streams can freeze solid but drilling holes are necessary to verify t

Conducting field work after Hurricane Irma on Bob Allen Key in Florida Bay, Everglades National Park, January 29, 2018. Lynn Wingard (left) and Miriam Jones (right) consult field notes from 2014 to decide where to take samples. Photo: B. Stackhouse, USGS

Root nodules are a symbiotic relationship between a plant and nitrogen-fixing bacteria. A symbiotic relationship is one where both organisms benefit. Nitrogen-fixing bacteria change inorganic nitrogen from the air into ammonia, a form of nitrogen most organisms can use.

USGS geologists are conducting field work at the summit today to make observations of volcanic ash and measure volcanic gas. This photograph is taken on Crater Rim Drive where the road intersects the Southwest Rift Zone. Rockfall dust and volcanic ash covers the ground and cracks in line with the Southwest Rift Zone trace traverse the pavement.

Map of seismicity (white circles) in the Yellowstone region during 2018. Yellow lines are roads, red line shows the caldera boundary, Yellowstone National Park is outlined in black, and dashed lines denote state boundaries.

 Colorado & Gunnison Basin map

A U.S. national map with notes about areas of high water use in 2015.

Three-dimensional model of Chimney Bluffs, New York along Lake Ontario created from low-altitude digital images collected from an unmanned aerial system (UAS).

A brain coral infected with Stony Coral Tissue Loss Disease (SCTLD) in the Florida Keys National Marine Sanctuary in April 2018.

On the right, a tiltmeter is ready for installation in a shallow borehole. On the left, the tiltmeter is located at the bottom of a 3 to 4 m (10 to 15 ft) borehole lined with a metal casing. The tiltmeter is surrounded by sand to secure it within the borehole so that it does not touch the casing.

A windblown stand of hemlock trees at the Wolverine Glacier field site

Aerial view of a southeast Louisiana coastal marsh.

Ambae Island is in the northern Vanuatu archipelago (Figure A, courtesy of NASA) and hosts a nested caldera at its summit. A temporary seismic-acoustic array was deployed beginning July 2018 (yellow squares). Local airports are marked by the red squares.

Amy Gartman waits for an X-ray diffractometer to analyze samples of hydrothermal sulfide minerals. 

Aquaculture water use in 2015

Artesian Well (cropped), John Pennekamp Coral Reef State Park, Key Largo, FL

Artesian Well, John Pennekamp Coral Reef State Park, Key Largo, FL

Available Precipitation - Average from 1934 to 2002 In Inches Per Year