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Photo ID: h4utel	Subject: Groundwater	Description
	Ground Water; Hydrologic Cycle; Hydrology; Hydrosphere; Mountains; Seep; Valley	Water seeps in badlands of Death Valley.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; California; Death Valley
Photo Quality \| Large	Available for Commercial Use

Photo ID: h4utgi	Subject: Groundwater	Description
	Discharge; Hydrogeology; Hydrologic Cycle; Hydrology; Hydrosphere; Sedimentary Rocks; Seeps; Water Resources	Water spring issuing from limestone.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; Texas
Photo Quality \| Large	Available for Commercial Use

Photo ID: h6iot5	Subject: Sedimentary Rocks	Description
	Chemical Weathering; Claron Formation; Erosion; Erosion Features; Geomorphology; Limestone; Lower Tertiary; Paleocene; Sandstone; Siltstone; Tertiary; Water Erosion; Weathering; Wind Erosion	The delicate coloring and formations in this image are produced by chemical weathering. This form of weathering occurs wherever seeping ground water circulating through the sandstone dissolves the calcium-carbonate cement between the individual grains, causing the rock to crumble to sand. Cavities work their way back into the walls of the escarpment. Over time, the cavities deepen and roofs collapse. Columns are formed which, in turn, finally topple. Pink, white, yellow, and red formations are produced by oxidation (chemical weathering) of the iron-bearing minerals found in the rock. View Geological Time Scale for this image.
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	North America; United States; Utah; Bryce Canyon National Park
Photo Quality \| Large	Available for Commercial Use

Photo ID: hl4fx9	Subject: Metal	Description
	Acids; Environment; Environmental Geology; Environmental Issues; Metals; Mines; Mining; Mining Geology; Pollution; Runoff; Seeps; Surface Water; Tailings; Water; Water Pollution	Metal bearing waters seeping from the base of mill tailings impundments along Silver Creek in the Rico mining district of southwest Colorado.
	Photographer	Location
	Travis Hudson Credit Line: Copyright © Travis Hudson, American Geological Institute	North America; United States; Colorado
Photo Quality \| Large	Available for Commercial Use

Photo ID: hl4g8o	Subject: Mining	Description
	Economic Geology; Environmental Geology; Environmental Issues; Impoundment; Lakes; Metals; Mines; Mining Geology; Permeability; Ponds; Saturation; Seeps; Surface Water; Tailings; Water	Large tailings impoundment with ponded surface water in Colorado. Because tailings contain very small particles such as clays, portions of the tailings will have low permeabilities. Surface waters from drainings that flow into the tailings and rain or snowfall, will commonly lead to ponded surface waters as illustrated here. This can sustain water-saturated conditions within the tailings and continue to feed the discharge of metal-bearing waters in seeps.
	Photographer	Location
	Travis Hudson Credit Line: Copyright © Travis Hudson, American Geological Institute	North America; United States; Colorado
Photo Quality \| Large	Available for Commercial Use

Photo ID: istuke	Subject: Surface Processes	Description
	Chemical Weathering; Claron Formation; Erosion; Erosion Features; Geomorphology; Lacustrine Environment; Limestone; Lower Tertiary; Paleocene; Sandstone; Sedimentary Rocks; Siltstone; Water Erosion; Weathering; Wind Erosion	The delicate coloring and formations are produced by chemical weathering. This form of weathering occurs wherever seeping ground water circulating through the sandstone dissolves the calcium-carbonate cement between the individual grains, causing the rock to crumble to sand. Cavities work their way back into the walls of the escarpment. Over time, the cavities deepen and roofs collapse. Columns are formed which, in turn, finally topple. Pink, white, yellow, and red formations are produced by oxidation (chemical weathering) of the iron-bearing minerals found in the rock. View Geological Time Scale for this image.
	Photographer	Location
	Larry Fellows Credit Line: Copyright © Larry Fellows	North America; United States; Utah; Bryce Canyon National Park
Photo Quality \| Large	Available for Commercial Use

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