Images

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.

Adult lionfish, approximately 250 mm total length.

A group of juvenile lionfish, approximately 120 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 spins are hollow and connected to poison glands.

The second repeat photograph documents significant changes that have occurred during the 63 years between photographs A and C, and during the 54 years between photographs B and C. Muir Glacier has retreated out of the field of view and is now more than 7 kilometers northwest. Riggs Glacier has retreated as much as 600 meters and thinned more than 250 meters.

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 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 its 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 spines are hollow and are connected to poison glands.

An asparagus cropland and golden hillsides taken in in the Central California Valley Ecoregion (CA) in September 2004.

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.

USGS scientist Bernard Hubbard conducting spectral measurements of soils and cover crops to ground truth satellite imagery being used to map soil erosion and runoff potential into the Chesapeake Bay watershed.

This native leafcutter bee, Trachusa zebratum, is a solitary bee species associated with sandy soils where the female builds her own nest to lay her eggs in.

Islands with angular landforms.

Sheer cliffs covered in vegetation encircling a lentic body of water.