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Arches National Park Utah park containing hundreds of sandstone arches eroded from the Jurassic Entrada Formation. http://farm2.staticflickr.com/1244/696548249_02906610dd.jpg Grand Canyon The Colorado River carved this canyon in Paleozoic and Precambrian rocks in Northern Arizona. http://farm1.staticflickr.com/83/225172333_39c37ff446.jpg Bryce Canyon Brightly colored hoodoos carved from Tertiary lake sediment of the Carmel Fromation characterize this park. http://farm1.staticflickr.com/185/423236031_20a93dcc26.jpg Mesa Verde National Park In the Colorado Park ancient Puebloan Indian built kivas and houses in natural alcoves in Cretaceous Sandstone. http://farm2.staticflickr.com/1123/1055569346_ff922116ee.jpg Zion National Park Utah park where tributaries of the Virgin River have carved canyons in the Navajo Sandstone. http://farm4.staticflickr.com/3333/3599409904_ac524c95fc.jpg Capitol Reef Utah park underlain by the Waterpocket monocline where the Navajo sandstone eroded into dome-shaped monoliths. http://farm4.staticflickr.com/3277/2933083761_22aa288451.jpg Mammoth Caves This 700+ mile-long carbonate cave system is found in Kentucky's Pennyroyal Plateau. http://farm3.staticflickr.com/2391/3834864679_c4ac1dbda0.jpg Hawaii Volcanoes National Park This park contains the world's most active basaltic shield volcano. http://farm4.staticflickr.com/3374/3577765348_f0246b51c6.jpg Yellowstone National Park Here geysers, mudpots, and thermal springs lie on top of a "supervolcano." http://farm4.staticflickr.com/3413/3647781764_5757736c2c.jpg Mount Rainier National Park This 14,411 ft (4,392 m) stratovolcano in Washington state is the highest mountain in the Cascade Range. http://farm1.staticflickr.com/216/472809273_c6ebf2f273.jpg Crater Lake National Park This large lake in Oregon occupies a caldera created when the 12,000 foot (3,660 meter) high stratovolcano, Mount Mazama, catastrophically erupted 7,700 years ago. http://farm4.staticflickr.com/3224/2850419681_8d7f0bcfbe.jpg Rocky Mountain National Park Longs Peak, composed of Precambrian granite, lies in this Colorado Park. http://farm2.staticflickr.com/1099/923020988_b67f654d03.jpg Painted Desert National Park The northern extension of Petrified Forest underlain by the colorful Chinlee Formation. http://farm2.staticflickr.com/1409/808125068_17944506b3.jpg Petrified Forest National Park Arizona park underlain by the Triassic Chinlee Formation containing the petrified remains of a tropical forest. http://farm4.staticflickr.com/3089/2557975988_44b4c028a6.jpg Lassen Peak National Park Felsic lava dome in California that is the southernmost Cascade volcano. Last erupted in 1917. http://farm3.staticflickr.com/2141/1691096271_0a5751e534.jpg Craters of the Moon National Monument Holocene basalt flows and cinder cones in Idaho's Snake River Plain http://farm1.staticflickr.com/90/282601165_87d743b692.jpg Glacier National Park National Park in Montana containing glaciated mountains composed of Precambrian sedimentary rocks. http://farm4.staticflickr.com/3498/3882946216_b3513a4b1e.jpg Carlesbad Caverns National Park Caves in New Mexico carved in part by sulfuric acid. http://farm4.staticflickr.com/3038/2693553152_1309a06b80.jpg Canyonlands National Park Utah park at the confluence of the Green and Colorado Rivers containing canyons, arches, and grabens in Paleozoic - Mesozoic sedimentary rock. http://farm4.staticflickr.com/3518/3458766612_3566997674.jpg North Cascade National Park The Washington park is composed of rocky terranes recently accreted to North America (geologicallly speaking). http://farm3.staticflickr.com/2741/4132172369_24cf10cf82.jpg Death Valley National Park A broad, youthful interior basin formed by normal faulting, and containing deposits of evaporite minerals, lake sediments, and alluvial fans. http://farm3.staticflickr.com/2198/2052148458_94aad35661.jpg