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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

A petrified tree in Petrified Forest National Park, AZ: A petrified tree on its side in Petrified Forest National Park, Arizona. The remains of its ancient root ball and the texture of its bark have been preserved by the petrification process. The tree's color is rich with traces of purple, red, blue, and green....; Format: image/photograph

A flower growing from a petrified tree in Petrified Forest National Park, AZ: A flower growing from a petrified tree in Petrified Forest National Park, Arizona. The flower is pink with delicate, feathery leaves. The tree is striped with orange, red, and plum purple. Petrified Forest National Park encompasses part of the Rainbow Forest...; 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

Petrified trees in Petrified Forest National Park, Arizona: Petrified trees in Petrified Forest National Park, Arizona. The geological structure of the crystalline quartz that forms the trees causes fractures clean across the trunk, giving the false impression that they've been cut with a chainsaw. These trees are...; Format: image/photograph

Colorful crystals in a petrified tree in Petrified Forest National Park, AZ: Colorful purple, blue, red, and orange crystals in a petrified tree in Petrified Forest National Park, Arizona. Petrified Forest National Park encompasses part of the Rainbow Forest and the Painted Desert. It consist of several "forests" of petrified wood....; Format: image/photograph

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.