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Photo ID: hi4opc	Subject: Volcanoes	Description
	Active Volcanoes; Cascade Range; Gases; Geologic Hazards; Measurements; Natural Hazards; Sampling; Stratovolcanoes; Volcanic Features; Volcanic Vents; Volcanism; Volcanology	In this image United States Geological Survey geologists collect gas samples from Mount Saint Helens. Samples were gathered from vents on the dome and crater floor, and were used to monitor changes in chemical composition. Additionally, sulfur dioxide gas was measured from a specially-equipped airplane before, during, and after eruptions to determine "emission rates" for the volcano. During eruptions, emission rates typically increased to 5 to 10 times their pre-eruptive value.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Hawaii; Kilauea Latitude: 0 / Longitude: 0
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Photo ID: hysipw	Subject: Structure	Description
	Deformation; Displacements; Folding; Folds; Lewis Thrust Fault; Orientation; Overturned Folds; Plate Tectonics; Reclined Folds; Recumbent Folds; Sedimentary Rocks; Structural Analysis; Structural Geology; Tectonics	Bedson Ridge in Jasper National Park. Recumbent fold.
	Photographer	Location
	Jim Moore Credit Line: Copyright Jim Moore	North America; Canada; Alberta; Bedson Ridge
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Photo ID: i8bkw3	Subject: Rivers	Description
	Arch Dams; Colorado River; Concrete Dams; Construction; Dam Sites; Dams; Design; Engineering Geology; Lakes; Man Made Structures; Reservoirs; Surface Water	The Glen Canyon Dam on the Colorado River is one of the largest concrete dams in the world and impounds Lake Powell which provides water for a large area of the arid Southwest. It also provides recreation in the Glen Canyon Recreation Area.
	Photographer	Location
	Bruce Molnia Credit Line: Copyright © Bruce Molnia, Terra Photographics	North America; United States; Arizona; Page; Glen Canyon Dam Latitude: 36.92 / Longitude: -111.48
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Photo ID: ij69rj	Subject: Environment	Description
	Arizona; Colorado River; Dams; Fresh Water; Hydroelectric Power; Lake Powell; Water Diversion; Water Impoundments; Water Storage	Water spews forth from the Glen Canyon Dam after fulfilling its hydroelectric function. The dam, one of the largest concrete dams in the world, impounds Lake Powell.
	Photographer	Location
	Michael Collier Credit Line: Copyright © Michael Collier	North America; United States; Utah; Glen Canyon Dam Latitude: 36.92 / Longitude: -111.48
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Photo ID: h4vk17	Subject: Environment	Description
	Damage; Deforestation; Ecology; Fires; Forest Fires; Natural Hazards; Rivers; Wilderness Areas; Wildfires	Image from the Bitterroot National Forest in Montana during August of 2000. The picture shows two elk standing in a stream seeking shelter from the rapidly-spreading flames. The fires here merged with the Mussigbrod wildfires to burn more than 247,000 acres.
	Photographer	Location
	John McColgan Credit Line: John McColgan, BLM Alaska Fire Service	North America; United States; Montana; Bitterroot National Forest Latitude: 45.93 / Longitude: -114.12
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Photo ID: h31zcz	Subject: Sedimentary Rocks	Description
	Bedding; Permian; Petrology; Sandstone; Sedimentary Structures; Stratification; Terrigenous Materials	Horizontal bedding in Cedar Mesa sandstone. Canyonlands National Park in Utah. View Geological Time Scale for this image.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; Utah; San Juan County; Canyonlands National Park Latitude: 38.17 / Longitude: -109.98
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Photo ID: h31zh0	Subject: Sedimentary Rocks	Description
	Clastic Rocks; Miocene; Petrology; Sediments; Terrigenous Materials	Conglomerate of the Furnace Creek formation. View Geological Time Scale for this image.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; California; Death Valley Latitude: 36.5 / Longitude: -117
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Photo ID: h31ziy	Subject: Sedimentary Rocks	Description
	Bedding Plane Irregularities; Dessication Structures; Mountains; Mudcracks; Petrology; Sedimentary Structures; Shrinkage Cracks; Valleys	Mudcracks seen in these rocks of Glacier National Park.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; Montana; Glacier National Park Latitude: 49 / Longitude: -113.92
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Photo ID: h31zky	Subject: Sedimentary Rocks	Description
	Bedding Planes; Canyons; Erosion; Paleozoic; Petrology; Sedimentary Structures; Valleys	Flat-lying Paleozoic sedimentary rocks of northwestern Arizona. View Geological Time Scale for this image.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; Arizona
Photo Quality \| Large	Available for Commercial Use

Photo ID: h31zov	Subject: Sedimentary Rocks	Description
	Bedding Planes; Limestone; Petrology; Shale	Shale with interbedded limestone.
	Photographer	Location
	Marli Miller Credit Line: Copyright © Marli Miller, University of Oregon	North America; United States; Ohio
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