Images

A photomicrograph depicting the siliceous frustules of fifty species of diatoms arranged within a circular shape. The image has been inverted to white on black to bring out details. Diatoms form the base of many marine and aquatic foodchains and upon death, their glassy frustules form sediments known as diatomaceous earth.

Davis Rd. carbon dioxide vent, Salton Sea, California.

A surface expression of geothermal activity.

Laura Coffey,a chemist at the National Water Quality Laboratory, loads on-line solid-phase extraction cartridges into the high-performance liquid chromatography/mass spectrometer (HPLC/MS) in preparation for testing and calibration

Sticky notes showing media interview requests by journalists following the 2004 Sumatra earthquake event. 

Image of schedule for news media interviews following Sumatra 2004 earthquake event. 

Photo showing an intense news media interview schedule following Sumatra 2004 earthquake event. 

John Clune and Connie Loper, PA Water Science Center, processing an emerging-contaminants bed-sediment sample at Rock Creek near Gettysburg, PA.

John Clune, PA Water Science Center, processing an emerging-contaminants bed-sediment sample at Lititz Run.

John Clune, PA Water Science Center, collecting an emerging-contaminants bed-sediment sample at the Susquehanna River at Danville,PA.

USGS scientist Cynthia Gardner examines fresh rock samples from the new growth on Mount St. Helens' dome,

Still relatively common in Louisiana, although amphibian declines are a global problem

Fall in Canyon de Chelly.

Geologist Ed Harp estimates rock-fall susceptibility in American Fork Canyon, UT.

Geologist Ed Harp estimates rock-fall susceptibility in American Fork Canyon, UT.

A group of juvenile lionfish, approximately 120 mm total length.

Adult lionfish, approximately 250 mm total length.

Conowingo Dam on the Susquehanna River in Maryland.         

Limestone rocks are the primary bed of this flashy river.  Note the baldcypress tree in the background uprooted in a past flood.  View looking downstream. 

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spins are hollow and connected to poison glands.