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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

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 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

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

Crumbling canyon on Artist's Drive in Death Valley, CA: Crumbling canyon on Artist's Drive in Death Valley, California. Visitors can take this 9-mile paved loop to see lovely volcanic and sedimentary rock hills. Artist's Drive is named for rich variation in the hue of its rocks, but its colors appeal even to the...; Format: image/photograph

Date Palms at Furnace Creek, Death Valley, CA: A stand of Date Palms at Furnace Creek, Death Valley, California. Date Palms are a non-native species, and park rangers work to remove as many of the plants as possible, as they crowd out native flora and fauna. The palms are one of the less insidious invaders;...; Format: image/photograph

Dead tree in Canyonlands National Park: The twisted remains of a dead tree stands in front of the smooth tops of rounded rock formations along a Chesler Park trail in the Needles section of Canyonlands National Park. The sedimentary rock layers have been exposed over millions of years of erosion....; Format: image/photograph

Delicate Arch: Formed of sandstone, Delicate Arch is the most recognized landmark in Arches National Park. In this photograph, the red sandstone terrain is barren and inhospitable. People standing beneath the arch can barely be seen. There are also people standing along...; Format: image/photograph

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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.