Tim Fitzharris / Full moon setting over Zabriskie Point, morning, Death Valley National Park, California

Tim Fitzharris / Opuntia (Opuntia sp) in Chihuahuan Desert landscape, Big Bend National Park, Texas

Tim Fitzharris / 750 foot tall sand dunes, tallest in North America, Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Sand dunes and the Mittens, Monument Valley Navajo Tribal Park, Arizona

Jim Brandenburg / Mexican Golden Poppy (Eschscholzia glyptosperma) field with Saguaro (Carnegiea gigantea) cactus, Organ Pipe Cactus National Monument, Arizona

Jim Brandenburg / Mexican Golden Poppy (Eschscholzia glyptosperma) field with Saguaro (Carnegiea gigantea) cactus, Organ Pipe Cactus National Monument, Arizona

Jim Brandenburg / Mexican Golden Poppy (Eschscholzia glyptosperma) field, Organ Pipe Cactus National Monument, Arizona

Yva Momatiuk & John Eastcott / Dry cracked mud on river bank in desert, San Juan River, Utah

Yva Momatiuk & John Eastcott / Sandstone buttes, ravines, and boulders in arid desert, Grand Staircase-Escalante National Monument, Utah

Yva Momatiuk & John Eastcott / Sandstone rock formations, Vermillion Cliffs National Monument, Arizona

Yva Momatiuk & John Eastcott / Sand dunes, Death Valley National Park, California

Yva Momatiuk & John Eastcott / Hikers on salt flat, Death Valley National Park, California

Yva Momatiuk & John Eastcott / White gypsum sand dunes, White Sands National Park, New Mexico

Yva Momatiuk & John Eastcott / Yucca (Yucca sp) growing on sand dune, White Sands National Park, New Mexico

Yva Momatiuk & John Eastcott / Toadstool hoodoo sandstone rock formations, Bisti Wilderness Area, New Mexico

Tim Fitzharris / Saguaro (Carnegiea gigantea) cacti and Lupine (Lupinus sp) at Gonzales Pass, Tonto National Forest, Arizona

Yva Momatiuk & John Eastcott / Lenticular and cumulus clouds above remote arid desert, Nevada

Yva Momatiuk & John Eastcott / Sandstone formations, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Yva Momatiuk & John Eastcott / Dry cracked panes of mud forming intricate patterns, Eureka Dunes, Death Valley National Park, California

Yva Momatiuk & John Eastcott / Domestic Cattle (Bos taurus) group in pasture under cumulus clouds in arid prairie landscape, central Wyoming

Kevin Schafer / Racetrack Playa with mysterious 'sailing stones', Death Valley National Park, California

Kevin Schafer / Dry mud flats, Death Valley National Park, California

Kevin Schafer / Racetrack Playa with mysterious 'sailing stones', Death Valley National Park, California

Tim Fitzharris / Joshua Tree (Yucca brevifolia), Joshua Tree National Park, California

Tim Fitzharris / Joshua Tree (Yucca brevifolia) and boulders, Joshua Tree National Park, California

Tim Fitzharris / Badlands, South Unit, Theodore Roosevelt National Park, North Dakota

Yva Momatiuk & John Eastcott / Colorful badlands, Zabriskie Point, Death Valley National Park, California

Yva Momatiuk & John Eastcott / Man hiker wearing shorts, a hat and a backpack, 52, walking alone in a big sprawling landscape of sand and distant mountains, across white sand dunes, evening, autumn, White Sands National Park, New M...

Yva Momatiuk & John Eastcott / Man hiker wearing shorts, a hat and a backpack, 52, walking alone in a big sprawling landscape of sand and distant mountains, across white sand dunes, evening, autumn, White Sands National Park, New M...

Yva Momatiuk & John Eastcott / Dry and cracking cakes of silt deposited by Colorado River during flood and drying during drought, fall morning, Glen Canyon National Recreation Area, Utah

Yva Momatiuk & John Eastcott / Dry and cracking cakes of silt deposited by Colorado River during flood and drying during drought, fall morning, Glen Canyon National Recreation Area, Utah

Yva Momatiuk & John Eastcott / Eroded sandstone cliffs and hills with colorful layers in Grand Staircase-Escalante National Monument, noon, Utah

Tim Fitzharris / Kitchen Mesa near Ghost Ranch, New Mexico

Tim Fitzharris / View from Tsegi Overlook, Cayon de Chelly National Monument, Arizona

Konrad Wothe / Soaptree Yucca (Yucca elata) growing in Gypsum Dunes, White Sands National Park, Chihuahua Desert, New Mexico

Konrad Wothe / Soaptree Yucca (Yucca elata) growing in Gypsum Dunes, White Sands National Park, Chihuahua Desert, New Mexico

Konrad Wothe / Soaptree Yucca (Yucca elata) growing in Gypsum Dunes, White Sands National Park, Chihuahua Desert, New Mexico

Patricio Robles Gil / Rock structures in the Chihuahuan Desert, Big Bend National Park, Texas

Tim Fitzharris / Gypsum dunes, Guadalupe Mountains National Park, Texas

Konrad Wothe / Soaptree Yucca (Yucca elata) growing in gypsum sand dunes, White Sands National Park, Chihuahua Desert, New Mexico

Konrad Wothe / Soaptree Yucca (Yucca elata) growing in gypsum sand dunes, White Sands National Park, Chihuahua Desert, New Mexico

Tim Fitzharris / Pepperweed (Lepidium sp) in bloom with El Capitan in distance, Guadalupe Mountains National Park, Texas

Tim Fitzharris / Mojave Yucca (Yucca schidigera) in rocky landscape, Mojave National Preserve, California

Tim Fitzharris / Mushroom Rock at North Window, Monument Valley, Arizona

Tim Fitzharris / Balanced rocks, Guadalupe Mountain National Park, Texas

Tim Fitzharris / Sandstone formations in Kaiparowits Plateau, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Sandstone formations in Kaiparowits Plateau, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Sandstone formations in Kaiparowits Plateau, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / East and West Temples showing sedimentary rocks including white Navajo sandstone, Zion National Park, Utah

Tim Fitzharris / Virgin Mountains from Lake Mead National Recreation Area, Nevada

Tim Fitzharris / Virgin Mountains from Lake Mead National Recreation Area, Nevada

Tim Fitzharris / Sandstone boulders in Valley of Fire State Park, Nevada

Tim Fitzharris / Red sandstone formations and desert vegetation, Valley of Fire State Park, Nevada

Tim Fitzharris / Red sandstone formations and desert vegetation, Valley of Fire State Park, Nevada

Tim Fitzharris / Black Mountains surrounding Valley of Fire State Park, Nevada

Tim Fitzharris / Red sandstone formations and desert vegetation, Valley of Fire State Park, Nevada

Tim Fitzharris / Wind ripples in Kelso Dunes, Mojave National Preserve, California

Tim Fitzharris / Wind ripples in Kelso Dunes, Mojave National Preserve, California

Tim Fitzharris / Kelso Dunes rising 600 feet over the desert floor, Mojave National Preserve, California

Tim Fitzharris / Kelso Dunes rising 600 feet over the desert floor, Mojave National Preserve, California

Tim Fitzharris / Wind ripples in Kelso Dunes, Mojave National Preserve, California

Tim Fitzharris / Joshua Tree (Yucca brevifolia), cinder cones, and other desert vegetation, Mojave National Preserve, California

Tim Fitzharris / Wilson arch with a span of 91 feet and height of 46 feet, off of highway 191, made of entrada sandstone, Utah

Tim Fitzharris / Wilson arch with a span of 91 feet and height of 46 feet, off of highway 191, made of entrada sandstone, Utah

Yva Momatiuk & John Eastcott / Colorful sandstone patterns of petrified sand dunes and ridges created by erosion, near Paria River, Vermilion Cliffs National Monument, Colorado Plateau, Utah

Gerry Ellis / Saguaro (Carnegiea gigantea) with Fishhook Barrel Cactus (Ferocactus wislizenii) in the foreground, Sonoran Desert, Arizona

Tim Fitzharris / Mesquite Flat Sand Dunes, Death Valley National Park, California

Tim Fitzharris / Mesquite Flat Sand Dunes, Death Valley National Park, California

Jim Brandenburg / Eroded buttes and sand dunes in Monument Valley Navajo Tribal Park, Arizona

Tim Fitzharris / Ocotillo (Fouquieria splendens) under stormy sky in front of Chisos Mountains, Big Bend National Park, Texas

Tim Fitzharris / Stormy skies over the Chisos Mountains, Big Bend National Park, Texas

Konrad Wothe / Salt flats at Badwater with polygon shapes, Death Valley National Park, California

Jim Brandenburg / Erosion exposes sedimentary layers, Badlands National Park, South Dakota

Jim Brandenburg / Flowering cactus, Organ Pipe National Monument, Arizona

Jim Brandenburg / Saguaro (Carnegiea gigantea) cactus field, Organ Pipe Cactus National Monument, Arizona

Jim Brandenburg / Saguaro (Carnegiea gigantea) cactus field, Organ Pipe Cactus National Monument, Arizona

Jim Brandenburg / Saguaro (Carnegiea gigantea) cactus, Organ Pipe Cactus National Monument, Arizona

Jim Brandenburg / Saguaro (Carnegiea gigantea) cactus at dawn, Organ Pipe Cactus National Monument, Arizona

Shin Yoshino / Sand dunes in the Great Sand Dunes National Monument, Colorado

Jim Brandenburg / Yucca (Yucca sp) back-lit, White Sands National Park, New Mexico

Jim Brandenburg / Saguaro (Carnegiea gigantea) cactus, Organ Pipe Cactus National Monument, Arizona

Jim Brandenburg / Saguaro (Carnegiea gigantea) cactus, Arizona

Jim Brandenburg / Great Sand Dunes National Monument, Colorado

Jim Brandenburg / Common Raven (Corvus corax) tracks in sand, Monument Valley National Monument, Arizona

Jim Brandenburg / Sunset over Grand Canyon National Park, Arizona

Jim Brandenburg / Desert Spiny Lizard (Sceloporus magister) sunning on rock, Monument Valley National Monument, Arizona

Jim Brandenburg / Buttes and sand dunes at dusk, Monument Valley Navajo Tribal Park, Arizona

Jim Brandenburg / Ripples in sand with buttes in background, Monument Valley Navajo Tribal Park, Arizona

Jim Brandenburg / Ripples in sand with buttes in background, Monument Valley Navajo Tribal Park, Arizona

Jim Brandenburg / Saguaro (Carnegiea gigantea) cactus, Organ Pipe Cactus National Monument, Arizona