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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

Aerial view of Nevada and Vernal Falls in Yosemite National Park, CA: Nevada and Vernal Falls seen aerially in Yosemite National Park, California. Nevada Falls (594 feet) appears at the top of the photo, and Vernal Falls (317 feet) appears at the bottom. Trails go to both waterfalls, but the one to Nevada Falls is more strenuous...; Format: image/photograph

Agate House in Petrified Forest National Park, AZ: The Agate House in Petrified Forest National Park, Arizona. Archeologists believe the original building was constructed almost ten centuries ago between A.D. 1050 and 1300. The ancient Puebloan people in the area used petrified wood sealed with mud mortar...; Format: image/photograph

Alligator and ducks on a pond, Everglades National Park, FL: Alligator and ducks on a pond, Everglades National Park, Florida. Everglades National Park was declared a national park in 1934, though it took the park's proponents another 13 years to acquire funds and land. The park protects approximately one-fifth of the...; Format: image/photograph

Along Chesler Park Trail in Canyonlands National Park: This photograph was taken looking up at the many layers of rock. Some of the layers are tan, some are red, and some are gray. Their ridges are smooth and rounded. Bushes and other plants are at their base.; Format: image/photograph

Along Peek-a-boo Trail in Bryce Canyon National Park: Fins, arches, and hoodoos can be seen in this photograph taken from Peek-a-boo Trail in Bryce Canyon National Park.; Format: image/photograph

Amphitheater Lake in the Tetons, Grand Teton National Park, WY: Amphitheater Lake in the Tetons, Grand Teton National Park, Wyoming. The lake gleams in a bowl formed by mountains. Amphitheater and Surprise Lakes are glacial lakes surrounded by subalpine meadows. They are located on a strenuous trail that offers outstanding...; Format: image/photograph

Angels Landing Trail, viewed from above, Zion National Park, Utah: Hikers on Angels Landing Trail, viewed from above, in Zion National Park, Utah. The trail was cut from a sheer drop of solid rock in 1926 and remains one of the park's most spectacular construction wonders. The top offers wonderful views of Zion Canyon. This...; Format: image/photograph

Animal petroglyphs on Newspaper Rock near Monticello, Utah: A detail of Newspaper Rock at Newspaper Rock State Historic Monument near Monticello, Utah. The petroglyphs depict what appear to be deer, lizards, bison, footprints, and a man riding a horse, among other figures. Newspaper Rock is one of the largest and most...; Format: image/photograph

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

Arch on Peek-a-boo Trail: This photograph was taken looking through an arch on Peek-a-Boo Trail in Bryce Canyon National Park. The arch is in a shadow and beyond it the Canyon's land formations can be seen.; Format: image/photograph

Arches Monument Utah: The land formations in Arches National Park have been evolving over millions of years. Rocks seem to balance atop pillars and plants live despite the harsh conditions.; Format: image/photograph

Arches National Park at sunset: The sun is setting and is partially obscured by a bank of clouds. Some of the land formations at Arches National Park can be seen in silhouette.; Format: image/photograph

The arms of a windswept tree on Sentinel Dome, Yosemite National Park, CA.: The arms of a windswept tree on Sentinel Dome, Yosemite National Park, CA. Its branches appear to embrace one another. Its limbs are weathered to a bleached silver and gold. Hikers on Sentinel Dome can enjoy a stunning 360 degree view of the mountain ranges...; Format: image/photograph

Awed visitors in Mariposa Grove, Yosemite National Park, CA: Visitors awed at giant sequoias in Mariposa Grove, Yosemite National Park, California. Mariposa Grove is home to hundreds of giant sequoias. While not the world's tallest tree, they are often considered for their sheer volume to be the largest living things...; Format: image/photograph

Awed visitors on the road in Mariposa Grove, Yosemite National Park, CA: Visitors awed at giant sequoias in Mariposa Grove, Yosemite National Park, California. Mariposa Grove is home to hundreds of giant sequoias. While not the world's tallest trees, they are often considered by their sheer volume to be the largest living things...; Format: image/photograph

Baby alligators in Shark Valley, Everglades National Park, FL: Baby alligators in Shark Valley, Everglades National Park, Florida. Shark Valley is at the heart of the park in a sawgrass marsh. Visitors can explore the area by boardwalk, hiking trail, or observation tower. Everglades National Park was declared a national...; Format: image/photograph

The bad lands at Petrified Forest National Park, AZ: Eroded rock formations in the bad lands at Petrified Forest National Park, Arizona. Deposition, uplift, and erosion have created a diverse landscape over millions of years. Many formations, such as mesas and buttes, are formed when a protective cap of sandstone...; Format: image/photograph

Bad lands in Petrified Forest National Park, AZ: The sculpted ridges of bad lands in Petrified Forest National Park, Arizona. The formations show that thousands of years of mineral deposition have created colorful stripes in the surface of the rock. Deposition, uplift, and erosion have created a diverse...; 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

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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.