Tim Fitzharris / Shrubs and mountains, Flaming Gorge National Recreation Area, Wyoming

Tim Fitzharris / Ponderosa Pine (Pinus ponderosa) trees, El Morro National Monument, New Mexico

Tim Fitzharris / Coniferous trees and cliff, El Morro National Monument, New Mexico

Tim Fitzharris / River in gorge, Rio Grande Gorge, Rio Grande del Norte National Monument, New Mexico

Tim Fitzharris / River in gorge, Rio Grande Gorge, Rio Grande del Norte National Monument, New Mexico

Tim Fitzharris / Rock formation, Cochetopa Hills, Rio Grande National Forest, Colorado

Jim Brandenburg / Trees at night, Blue Mounds State Park, Minnesota

Jim Brandenburg / Sediment filled wave, Lake Superior, Minnesota

Jim Brandenburg / Snowdrift and trees in early spring, Minnesota

Sumio Harada / Moon over coniferous forest, Glacier National Park, Montana

Sumio Harada / Mountain near Two Medicine Lake, Glacier National Park, Montana

Sumio Harada / Mountains along lake, Swiftcurrent Lake, Glacier National Park, Montana

Sumio Harada / Mount Wilbur, Glacier National Park, Montana

Sumio Harada / Mount Saint Nicholas, Glacier National Park, Montana

Sumio Harada / Mount Gould from Lake Josephine, Glacier National Park, Montana

Sumio Harada / Mountain range along lake, Lake Sherburne, Many Glacier, Glacier National Park, Montana

Sumio Harada / Kayaker on lake, Lake McDonald, Glacier National Park, Montana

Sumio Harada / Burned areas two weeks after fire, Glacier National Park, Montana

Jeff Foott / Sand dunes, Eureka Dunes, Last Chance Range, Death Valley National Park, California

Jeff Foott / Spray Falls, Pictured Rocks National Lakeshore, Lake Superior, Michigan

Jeff Foott / Halgaito shale rock formation called 'Mexican Hat' on the San Juan River in south-central, Utah

Jeff Foott / Halgaito shale rock formation called 'Mexican Hat' on the San Juan River in south-central, Utah

Jeff Foott / Rock formation, Utah

Norbert Wu / Oak (Quercus sp) trees and grasses in winter, Gilroy, California

Norbert Wu / California Poppy (Eschscholzia californica) flowering on hillside, California

Norbert Wu / Heermann's Tarweed (Holocarpha heermannii) flowering on hillside, California

Norbert Wu / Breaking wave, Carmel Beach, California

Norbert Wu / Breaking wave, Carmel Beach, California

Sebastian Kennerknecht / Border wall seperating Mexico and United States, Blue Angels Peak, Sierra de Juarez, Colorado Desert, Sonoran Desert, California

Sebastian Kennerknecht / Boulders covering hills in desert, Blue Angels Peak, Sierra de Juarez, Colorado Desert, Sonoran Desert, California

Tim Fitzharris / Ocotillo (Fouquieria splendens) with rainbow Gobbler Knob formation, Sacramento Mountains, Lincoln,New Mexico

Tim Fitzharris / Sunset over Rio Grande gorge at Sheep Crossing, Rio Grande del Norte National Monument, New Mexico

Tim Fitzharris / Clouds over Sangre de Cristo Mountain Range, New Mexico

Tim Fitzharris / Rio Grande Wild and Scenic River, Rio Grande del Norte National Monument, New Mexico

Tim Fitzharris / Rio Grande Wild and Scenic River, view from Sheep Crossing to Ute Mountain, Rio Grande del Norte National Monument, New Mexico

Tim Fitzharris / Rio Grande Wild and Scenic River,view from Sheep Crossing to Ute Mountain, Rio Grande del Norte National Monument, New Mexico

Tim Fitzharris / Rocky Mountain Juniper (Juniperus sp) trees at lake, Santa Cruz Lake Recreation Area, New Mexico

Tim Fitzharris / Common Cattail (Typha latifolia) along the Rio Grande, Rio Grande del Norte National Monument, New Mexico

Tim Fitzharris / The Rock Garden, Clayton Lake State Park, New Mexico

Tim Fitzharris / Giant cumulonimbus clouds, near Des Moines, New Mexico

Tim Fitzharris / Giant cumulonimbius cloud and rainbow, Sierra Grande, near Capulin, New Mexico

Tim Fitzharris / Giant cumulonimbius cloud, Sierra Grande shield volcano, near Cauplin, New Mexico

Tim Fitzharris / Capulin Volcano cinder code, extinct, Capulin Volcano National Monument, New Mexico

Tim Fitzharris / Ocotillo (Fouquieria splendens) and mesa, Lincoln National Forest, Sacramento Mountains, New Mexico

Yva Momatiuk & John Eastcott / Contrails and cumulus clouds, New Mexico

Yva Momatiuk & John Eastcott / Pond in mountain meadow, Rocky Mountains, Colorado

Yva Momatiuk & John Eastcott / Toadstool hoodoo, white sandstone rock formations, Grand Staircase-Escalante National Monument, Utah

Yva Momatiuk & John Eastcott / White sandstone rock formations, Grand Staircase-Escalante National Monument, Utah

Yva Momatiuk & John Eastcott / White sandstone rock formations, Grand Staircase-Escalante National Monument, Utah

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

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

Yva Momatiuk & John Eastcott / Volcanic rocks, Death Valley National Park, California

Yva Momatiuk & John Eastcott / Joshua Tree (Yucca brevifolia) group, Joshua Tree National Park, California

Yva Momatiuk & John Eastcott / Joshua Tree (Yucca brevifolia) group, Joshua Tree National Park, California

Yva Momatiuk & John Eastcott / Joshua Tree (Yucca brevifolia) group, Joshua Tree National Park, California

Yva Momatiuk & John Eastcott / Joshua Tree (Yucca brevifolia) group at night, Joshua Tree National Park, California

Yva Momatiuk & John Eastcott / Sandstone rock formations, Snow Canyon State Park, Utah

Yva Momatiuk & John Eastcott / Sandstone rock formations, Snow Canyon State Park, Utah

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

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

Yva Momatiuk & John Eastcott / Eroded rock formations, Utah

Yva Momatiuk & John Eastcott / Eroded rock formations, Utah

Yva Momatiuk & John Eastcott / Cirrus cloud, Utah

Yva Momatiuk & John Eastcott / Mountain peak after first snow, Rocky Mountains, Colorado

Yva Momatiuk & John Eastcott / Flowering shrub and lava bed, Craters of the Moon National Monument, Idaho

Yva Momatiuk & John Eastcott / Low clouds over Mount Rainer, Mount Rainier National Park, Washington

Yva Momatiuk & John Eastcott / Evening clouds reflecting in river and canoes, Snake River, Idaho

Yva Momatiuk & John Eastcott / Evening clouds reflecting in river, Snake River, Idaho

Yva Momatiuk & John Eastcott / Evening clouds reflecting in river, Snake River, Idaho

Yva Momatiuk & John Eastcott / Pumpjacks working with flames flaring from excess natural gas, Williston Basin, North Dakota

Yva Momatiuk & John Eastcott / Toxic water evaporation pit lined with plastic, Williston Basin, North Dakota

Yva Momatiuk & John Eastcott / Joshua Tree (Yucca brevifolia) and rock formation, Joshua Tree National Park, California

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

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

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

Yva Momatiuk & John Eastcott / Sandstone rocks, Grand Staircase-Escalante National Monument, Utah

Yva Momatiuk & John Eastcott / Hoodoos, Bryce Canyon National Park, Utah

Yva Momatiuk & John Eastcott / Hoodoos, Bryce Canyon National Park, Utah

Yva Momatiuk & John Eastcott / Lava bed, Cedar Breaks National Monument, Utah

Yva Momatiuk & John Eastcott / Lava bed, Cedar Breaks National Monument, Utah

Yva Momatiuk & John Eastcott / Sandstone rock formations and clouds, Zion National Park, Utah

Tim Fitzharris / River at sunrise, Rio Chama, New Mexico

Tim Fitzharris / Lichen on rocks, Mount Scott, Wichita Mountains National Wildlife Refuge, Oklahoma

Tim Fitzharris / Rock arch, La Ventana Arch, El Malpais National Monument, New Mexico

Tim Fitzharris / Rock arch, La Ventana Arch, El Malpais National Monument, New Mexico

Tim Fitzharris / Dead tree and desert, Ghost Ranch, New Mexico

Tim Fitzharris / Mountain at sunset, El Capitan, Guadalupe Mountains National Park, Texas

Tim Fitzharris / Rock formations, City of Rocks State Park, New Mexico

Tim Fitzharris / Rock formation at dawn, Chimney Rock, Ghost Ranch, New Mexico

Matthias Breiter / Mountains at sunrise, Grand Tetons, Grand Teton National Park, Wyoming

Jeff Foott / Sandstone formations, Zion National Park, Utah

Jeff Foott / Seastack at Harris Beach State Park, Oregon

Jeff Foott / Mountain range reflected in water, Cottonball Basin, Death Valley National Park, California

Jeff Foott / Joshua Tree (Yucca brevifolia), Death Valley National Park, California

Jeff Foott / Joshua Tree (Yucca brevifolia), Death Valley National Park, California

Jeff Foott / Joshua Tree (Yucca brevifolia), Death Valley National Park, California