highway_trekker
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Slate yields to brilliant lichens in Merced Falls, California.

Minerals streak the hills of Oregon's Painted Hills State Park.

Concentric rings of color decorate a crystal found in Albany, Oregon.

Lines reverberate in ever widening swirls from a rock in Moab, Utah.

Patterned sandstone creates an optical illusion in the Wave rock formation, part of Coyote Buttes in Vermillion Cliffs National Monument, Arizona.

Erosion reveals swirls of color and pattern in rocks in Point Lobos State Reserve, California.

Pahoehoe lava darkens into ropy strands in Hawaii Volcanoes National Park

Striated sandstone lines the slopes of Coyote Buttes in Vermillion Cliffs National Monument, Arizona.

Eroded rocks pop with colorful designs in Point Lobos State Reserve, California.

Crimson striations run through a sandstone rock face in Petra in Jordan
Source: National Geographic Photo Gallery