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Tuff Canyon near the Castelon area of Big Bend National Park: This photograph shows the Tuff Canyon Cliff near the Castalon area. Tuff is “a rock composed of consolidated or cemented volcanic ash.” These gray cliffs show a great deal of erosion from Blue Creek as it cut through the rock. Strewn at the base...; Format: image/article

Acidic cove forest on a mountain creek: In Jocassee Gorges: Temperate rain forests of the Blue Ridge, page 11; The water that runs off the high slopes and off the Highlands Plateau is quickly organized into creeks and begins its descent towards the sea. The upper reaches of these creeks are too small to have great erosive power, but they can still carry sediments downstream...; By Dirk Frankenberg and Stephanie Walters.

Animal tracks in the dried mud in Death Valley, California: Animal tracks in the dried mud in Death Valley, California. Occasional, brief rainstorms create a thin veneer of mud that later dries up into cracked plates, preserving the tracks of anything that walked on it when wet. Death Valley National Park is located...; Format: image/photograph

Balanced Rock at Arches National Park: The size of three school buses, Balanced Rock appears to be precariously perched on its pedestal. The red sandstone landform has eroded over millions of years. Next to Balanced Rock is a smaller balanced rock called “Chip Off the Old Block.” This...; Format: image/photograph

Beach Erosion: Format: image/photograph

A beachfront house threatened by erosion: In Evidence of rising sea level: Coastal erosion and plant community changes, page 3; Figure 2 shows a beachfront house being undercut by waves. Unfortunately, this kind of damage happens frequently as sea level rises and erosion eats into the shoreline. Erosion into housing areas usually occurs when something happens to increase the local...; By Dirk Frankenberg.

A broken, orange ridge at Zabriskie Point in Death Valley, CA: The view from Zabriskie Point in Death Valley, California. A jagged stone mountain ridge zigzags across the landscape, lit sharply by afternoon sun. The stone is a rich, rust orange. Zabriskie Point is well-known for its outstanding views of the eroded valley...; Format: image/photograph

Bryce Canyon, Utah: Spectacular colors can be seen in the layers of sediment in this photograph taken in Bryce Canyon National Park. There are pinks, purples, terracotta, tan, and white layers.; Format: image/photograph

A cactus with rose-colored spines near Death Valley, CA: A cactus with rose-colored spines and green flesh near Death Valley, California. Though the surrounding Mojave Desert is rich with cacti and other succulent species, they are a fairly rare sight in Death Valley due to the extreme heat and salinity of much...; Format: image/photograph

Cape Hatteras Lighthouse: In Natural and human impacts on the northern Outer Banks, page 19; No structure better symbolizes the human struggle to cope with natural processes of the Outer Banks than the Cape Hatteras Lighthouse. The first Cape Hatteras lighthouse was built in 1802, more than 3,000 feet from the coeval shoreline. The base of that first...; By Blair Tormey and Dirk Frankenberg.

Central Park area of Arches National Park: Park Avenue has “fins” of rock that tower above flat terrain. The Entrada red sandstone formations have been evolving for millions of years and they are constantly changing due to erosion.; Format: image/photograph

Chelser Park Trail in Needles area of Canyonlands National Park: This image shows the smooth tops of rock formations seen from the Chesler Park Trail in Canyonlands National Park. The trail is located in the Needles section of the park. Just above the crests of the rocks, the tops of trees are visible. In the distance,...; Format: image/photograph

Chelser Park Trail in Needles area of Canyonlands National Park: Over millions of years sedimentary rock has eroded into the formations that are present today in Canyonlands National Park. This photograph shows the multi-colored layers of rock towering above the high desert floor below. The green scrubby bushes and trees...; Format: image/photograph

Chelser Park, Canyonlands National Park: These odd looking rock formations have mushroom-shaped tops. The base of the formations are terracotta red and the “caps” are tan. In the background taller formations can be seen with horizontal cracks running all the way across them. Green shrubbery...; Format: image/photograph

A chemical mine near Death Valley, CA: A mine near Death Valley National Park, California. Piles of a white mineral, possibly borax, dominate the front of the mine. Mountains rise in the background. Until 1976, Death Valley National Monument was open to new mining claims, which allowed companies...; Format: image/photograph

Chesler Park Trail in the Needles area of Canyonlands National Park: This photograph shows how erosion has carved the sedimentary rock over millions of years. The boulder in the foreground is breaking down and chips of rock litter the ground next to it. The rocks in the background have perfectly straight horizontal cracks running...; Format: image/photograph

The Colorado River, Grand Canyon National Park, AZ: The Colorado River, Grand Canyon National Park, Arizona. The river winds through craggy rock ridges. The Grand Canyon is located on the Colorado Plateau. The plateau was uplifted as the Colorado River and its tributaries carved channels into the rock over...; Format: image/photograph

Craggy cliff walls on Bright Angel Trail, Grand Canyon National Park, AZ: Craggy cliff walls on Bright Angel Trail, Grand Canyon National Park, Arizona. The Grand Canyon is located on the Colorado Plateau. The plateau was uplifted as the Colorado River and its tributaries carved channels into the rock over a period of thousands...; Format: image/photograph

Craggy cliff walls on Bright Angel Trail, Grand Canyon National Park, AZ: Craggy cliff walls on Bright Angel Trail, Grand Canyon National Park, Arizona. Evergreen shrubs sprout from crevices in the rock. The Grand Canyon is located on the Colorado Plateau. The plateau was uplifted as the Colorado River and its tributaries carved...; Format: image/photograph

A creek at middle elevations: In Roan Mountain Highlands, page 18; Figure 16 shows the same creek as that in Figure 15, but at an elevation about 1000 feet closer to sea level. Note the almost uniform roundness of the boulder edges when compared to those in Figure 15. The boulders here are also smaller than those in Figure...; By Jennifer Godwin-Wyer and Dirk Frankenberg.

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LEARN NC, a program of the University of North Carolina at Chapel Hill School of Education, finds the most innovative and successful practices in K–12 education and makes them available to the teachers and students of North Carolina — and the world.