 | Valley of Fire, Nevada
Valley of Fire, Nevada's first state park, is a canyon of multicolored sculpted rock that has inspired generations of human beings.
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| Hells Canyon Eco-Tour - Part 1
Ancient petroglyphs, big-horned sheep, steelhead and of course spectacular scenery highlight a jet boat tour of Hells Canyon.
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| Flooding the Grand Canyon - Part 1
A controlled flood was released on the Grand Canyon in 1996 to try to reintroduce natural conditions absent since the Glen Canyon Dam was built.
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| Flooding the Grand Canyon - Part 3
Research teams use different methods to monitor various aspects of the Colorado River's flow during the controlled flood of the Grand Canyon.
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| Flooding the Grand Canyon - Part 5
As the controlled flood of the Grand Canyon slowly recedes, researchers study its effects on native fish, organic material and sediments.
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| Flooding the Grand Canyon - Part 6
After the controlled flooding of the Grand Canyon, researchers return to examine the changes made by the flood.
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| Flooding the Grand Canyon - Part 7
After the floodwaters have completely receded, scientists and resource managers discuss the impact the first controlled flood had on the Grand Canyon.
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| Badlands National Park - White River Badlands
The erosive power of the White River shaped South Dakota's Badlands, carving through sedimentary layers and revealing fossils of animals long extinct.
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| Theodore Roosevelt National Park - Little Missouri
The Little Missouri River flows through North Dakota's Theodore Roosevelt National Park, slicing the landscape into breathtaking canyons.
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| Bryce Canyon, Utah
The richly-colored painted walls of Bryce Canyon National Park in Utah contrast with the vegetative landscape above.
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| Bryce Canyon, Utah - Rim Trail and Canyon
The same water that flowed through layers of sedimentary rock to create Bryce Canyon now nurtures plants in the bottom of the canyon.
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| Theodore Roosevelt National Park - Flora and Fauna
Delicate wildflowers, a resting doe and a pair of orioles are visible from the trail at North Dakota's Theodore Roosevelt National Park.
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| Colorado National Monument - Sandstone Landscape
The dry, desert-like landscape of Colorado National Monument supports a surprising array of plants and animals, from junipers to golden eagles.
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| Colorado National Monument - Canyon
In a geological drama easily visible from above, shifting earth and eroding wind and water slowly shaped the land that is now Monument Canyon.
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| Flooding the Grand Canyon - Part 2
Research teams gather data to determine the effect of a controlled flood on the geography and ecological systems of the Grand Canyon.
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| The Grand Canyon
Though the ancient age and awesome size of the Grand Canyon is sometimes difficult to conceptualize, the beauty of the canyon speaks for itself.
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| Stanton's Grand Canyon Photos
Robert Brewster Stanton led the second expedition through the Grand Canyon in the 1800s, which undertook a detailed photographic survey.
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| The Glen Canyon Dam
Built in the early 1960s, the Glen Canyon Dam has contributed to changes in the Grand Canyon's ecosystem, both in terms of plant and animal life.
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| Grand Canyon Erosion
With the Glen Canyon Dam in place, sediments that once moved down through the Grand Canyon are trapped and therefore unable to rebuild sandy beaches.
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| Glen Canyon Environmental Studies
The Glen Canyon Dam on the Colorado River had an unforeseen impact on the ecosystem of the Grand Canyon, the effects of which scientists are now studying.
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| Grand Canyon Fish Study
Many teams of scientists are busily studying the effects the Glen Canyon Dam has had on the Grand Canyon's fish species.
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| Mapping the Grand Canyon Riverbed
Determining fish habitat in the Grand Canyon is best accomplished with the help of a map that charts the many aspects of the river.
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| Grand Canyon Debris Flows
Once natural occurrences on the Colorado River, debris flows have been interrupted by the Glen Canyon Dam which regulates water flow through the canyon.
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| Big Bend National Park - The Power of Water
Water has been a primary force in the changing landscape at Big Bend National Park in Texas, where the Rio Grande has carved a canyon out of rock.
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| Big Bend National Park - Canyon and Volcano
While the endless flow of the Rio Grande River wore away at rock to create the canyon, volcanic activity built up another part of Big Bend National Park.
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| Adventure in Oregon's Honeycombs
The remote area in eastern Oregon known as the Honeycombs offers spectacular rock formations and caves that were once home to ancient humans.
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| Breaks Interstate Park
Spanning an area which falls in both Kentucky and Virginia, Breaks Interstate Park is home to the largest canyon east of the Mississippi.
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| The Geology of Hells Canyon
Find out how Idaho's great Hells Canyon was formed, and what it means to people today.
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