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geological formation

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Anthropocene
Atoll
Carlsbad Caverns
Cascade
Cliff
Coal
Fossil
Grand Canyon
Granite
Great Sand Dunes
Hot Springs
Late Cretaceous Period
Limestone
Lithosphere
Mammoth Cave National Park
Mesa
Metamorphic Rock
Minerals
Mount St. Helens
Petrified Forest
Pinnacles
Residue
Rift Valley
Rocks
Sandstone
Sedimentary Rock
Stratovolcano

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