Tim Fitzharris / Crowfoot Mountains and Bow Lake, Icefields Parkway, Rocky Mountains, Alberta, Canada

Clay Bolt / Central bumble bee (Bombus centralis) pollinating wildflowers in the Bridger Range, Bozeman, Montana. August.

Floris van Breugel / Bristlecone pine (Pinus aristata) abstract view of exposed and weathered wood layers, White Mountains, California, USA July

Floris van Breugel / Ancient Bristlecone pine (Pinus aristata) clings to life, with a grand view of endless sage valleys, White Mountains, California, USA, July

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

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

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in autumn, Rocky Mountains, Colorado

Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in autumn, Rocky Mountains, Colorado

Kevin Schafer / Frozen gas bubbles beneath surface of frozen lake, Abraham Lake, Canadian Rockies, Alberta, Canada

Gerrit Vyn / Rain showers over sagebrush-steppe at the foot of the Sawtooth Mountains. Clark County, Idaho, USA, June.

Kirkendall-Spring / Squaretop Mountain, Bridger Wilderness of the Wind River Range, Bridger National Forest, Wyoming, USA.

Eric Baccega / Spirit Island, Maligne Lake, Jasper National Park, Rocky Mountains, Alberta, Canada, September 2009