Nature

The origin of life on Earth is not well understood, but it is known to have occurred at least 3.5 billion years ago, during the hadean or archean eons on a primordial Earth that had a substantially different environment than is found at present. These life forms possessed ...

Hidden Lake in Mount Rainier National Park, Washington

Hidden Lake in Mount Rainier National Park, Washington

1024x768, 242K

Trail From Launch At White Sands Missile Range, New Mexico

Trail From Launch At White Sands Missile Range, New Mexico

1024x768, 87K

Cool Water, Sawtooth Wilderness, Idaho

Cool Water, Sawtooth Wilderness, Idaho

1024x768, 267K

Leaf Fall in Dixie National Forest, Utah

Leaf Fall in Dixie National Forest, Utah

1024x768, 259K

Clouds over Mount Chiquita, Ypsilon Mountain

Clouds over Mount Chiquita, Ypsilon Mountain

1024x768, 269K

Sandstone Interior, Antelope Canyon, Arizona

Sandstone Interior, Antelope Canyon, Arizona

1024x768, 165K

Cape of Good Hope, South Africa

Cape of Good Hope, South Africa

1024x768, 159K

Christine Falls, Mount Rainier, Washington

Christine Falls, Mount Rainier, Washington

1024x768, 342K

Storm Clouds over the Ocean

Storm Clouds over the Ocean

1600x1200, 332K

Sudden Impact

Sudden Impact

1600x1200, 162K

Azaleas And Live Oaks, Magnolia Plantation, Charleston, South Carolina

Azaleas And Live Oaks, Magnolia Plantation, Charleston, South Carolina

1024x768, 361K

Chesapeake Bay Beach, Maryland

Chesapeake Bay Beach, Maryland

1024x768, 130K

Crater Lake In Winter, Crater Lake National Park, Oregon

Crater Lake In Winter, Crater Lake National Park, Oregon

1024x768, 191K

The Axis of Serenity, Mount Rainier National Park, Washington

The Axis of Serenity, Mount Rainier National Park, Washington

1024x768, 202K

Mono Lake, Lee Vining, East California

Mono Lake, Lee Vining, East California

1024x768, 160K