Matthias Breiter / Sockeye Salmon (Oncorhynchus nerka) jumping upstream during spawning season, Brooks Falls, Katmai National Park, Alaska

Matthias Breiter / Sockeye Salmon (Oncorhynchus nerka) jumping upstream during spawning season, Brooks Falls, Katmai National Park, Alaska

Konrad Wothe / Sockeye Salmon (Oncorhynchus nerka) leaping up Brooks River Falls during spawning season, Katmai National Park, Alaska

Jeff Foott / Cottonwood (Populus sp) tree in hole, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Pine (Pinus sp) tree, Monument Canyon, Colorado National Monument, Colorado

Jeff Foott / Dwarf Purple Monkeyflower (Mimulus nanus) flowers in old lava, Craters of the Moon National Monument, Idaho

Jeff Foott / Dwarf Purple Monkeyflower (Mimulus nanus) flowers in old lava, Craters of the Moon National Monument, Idaho

Jeff Foott / Flower on rock in stream, Yosemite National Park, California

Yva Momatiuk & John Eastcott / Tamarisk (Myricaria sp) growing in dry mud, Colorado River, Utah

Jeff Foott / Pinon Pine (Pinus edulis) tree on sandstone, Zion National Park, Utah

Jeff Foott / Pine (Pinus sp) tree on sandstone, Zion National Park, Utah

Jeff Foott / Yellow Rock Nettle (Eucnide bartonioides) flowering, Big Bend National Park, Texas

Jeff Foott / Yellow Rock Nettle (Eucnide bartonioides) flowering, Big Bend National Park, Texas

Gerry Ellis / Ama'u Fern (Sadleria sp) in lava field, Hawaii Volcanoes National Park, Hawaii

Sebastian Kennerknecht / Flooded road, Merced, California

Kevin Schafer / Jeffrey Pine (Pinus jeffreyi) seedlings growing in pumice, eastern Sierra Nevada, California

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

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

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

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

Konrad Wothe / Soaptree Yucca (Yucca elata) pair in gypsum sand, White Sands National Park, New Mexico

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

Tim Fitzharris / Subalpine Fleabane (Erigeron peregrinus), Snow Cinquefoil (Potentilla nivea) and Alpine sunflowers growing amid rocks, Mosquito Pass, Colorado

Tim Fitzharris / Lone pine tree with East and West Temples in the background, Zion National Park, Utah

Michio Hoshino / Dall's Sheep (Ovis dalli) group on a steep snowy hillside, Alaska

Winfried Wisniewski / New growth on lava, Big Island, Hawaii

Tim Fitzharris / Fremont Cottonwood (Populus fremontii) trees growing in the Chihuahuan Desert at White Sands National Park, New Mexico

Tim Fitzharris / Fremont Cottonwood (Populus fremontii) tree single tree in desert, White Sands National Park, Chihuahuan Desert New Mexico

Mark Moffett / Seedling emerging from forest floor, Maine

Yva Momatiuk & John Eastcott / Dall's Sheep (Ovis dalli) spring lamb climbs down steep rock face, Brooks Range, North Slope, Alaska

Tim Fitzharris / Bristlecone pine, Mt Evans, Colorado

Gerry Ellis / Fremont Cottonwood (Populus fremontii) tree in Chihuahuan Desert, White Sands National Park, New Mexico

Jim Brandenburg / Maize (Zea mays) plants suffering from dust storms, erosion, and drought, Minnesota

Jim Brandenburg / Douglas Fir (Pseudotsuga menziesii) tree reaching towards the sky, Bryce Canyon National Park, Utah

Gerry Ellis / Tree clinging to sandstone formation in slickrock country, Zion National Park, Utah

Tim Fitzharris / Snag in front of Fiery Furnace labyrinth showing narrow sandstone canyons and fins, Arches National Park, Utah

Tim Fitzharris / Coyote tracks flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado

Tim Fitzharris / Flowering shrubs on the dune fields in front of the Sangre de Cristo Mountains, Great Sand Dunes National Monument, Colorado

Matthias Breiter / Climber overlooking Great Gorge of the Ruth Glacier and MooseÆs Tooth, Denali National Park and Preserve, Alaska

Jim Brandenburg / Fish victims of drought, Texas

Konrad Wothe / Sockeye Salmon (Oncorhynchus nerka) leaping up Brooks River Falls during spawning season, Katmai National Park, Alaska

Larry Minden / Red-tailed Hawk (Buteo jamaicensis) in icy tree, California

Jim Brandenburg / Great Basin Bristlecone Pine (Pinus longaeva) tree in snow, Great Basin National Park, Nevada

Michio Hoshino / Common Redpoll (Carduelis flammea) perching on branch in a snowstorm, Alaska

Jim Brandenburg / American Bison (Bison bison) group walking along trail in a snowstorm, Ordway Prairie, South Dakota

Larry Minden / Mouth of Grand Gulch, Canyon Country, Utah

Jeff Foott / Ponderosa Pine (Pinus ponderosa) tree and water-stained cliff, Long Canyon, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Cottonwood (Populus sp) tree in hole, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Scabland Penstemon (Penstemon deustus) flowering in lava field, Craters of the Moon National Monument, Idaho

Jeff Foott / Dwarf Purple Monkeyflower (Mimulus nanus) flowering in lava field in spring, Craters of the Moon National Monument, Idaho

Jeff Foott / Mountain Hollyfern (Polystichum scopulinum) in lava field, Craters of the Moon National Monument, Idaho

Jeff Foott / Dwarf Purple Monkeyflower (Mimulus nanus) flowering in lava field in spring, Craters of the Moon National Monument, Idaho

Jeff Foott / Sticky Cinquefoil (Potentilla glandulosa) in lava field, Craters of the Moon National Monument, Idaho

Jeff Foott / Lava field with pioneer grasses, Craters of the Moon National Monument, Idaho

Jeff Foott / Lava field with pioneer grasses, Craters of the Moon National Monument, Idaho

Jeff Foott / Onion (Allium sp) flowering in lava field, Craters of the Moon National Monument, Idaho

Jeff Foott / Bitterbrush (Purshia sp) in lava field at sunset, Craters of the Moon National Monument, Idaho

Jeff Foott / Limber Pine (Pinus flexilis) in lava field, Craters of the Moon National Monument, Idaho

Tim Fitzharris / Cottonwood (Populus sp) tree along lake, Granite Dells, Watson Lake, Arizona

Michael Durham / Wildflowers growing in cinder rocks, Craters of the Moon National Monument, Idaho

Kevin Schafer / Pine seedling and Half Dome at sunset, Yosemite National Park, California

Michael Quinton / American Bison (Bison bison) in snowfall, Yellowstone National Park, Wyoming

Mark Moffett / Seedling emerging from forest floor, Maine

Jim Brandenburg / Cotton farmer with handful of dust in front of drought-stricken crops, west Texas

Shin Yoshino / Bighorn Sheep (Ovis canadensis) group against stormy sky, Yellowstone National Park, Wyoming

Jim Brandenburg / Ancient cedar trees growing on ledge, Northwoods, Minnesota

Jeff Foott / Desert Sunflower (Geraea canescens) in rocks, Death Valley National Park, California

Jeff Foott / Claret Cup Cactus (Echinocereus triglochidiatus) flowering, Arches National Park, Utah