[Iris siberica]

Intricate boxwork in Wind Cave, a cave formation found here more than anywhere else, Wind Cave National Park, South Dakota, USA

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Photographers on cauliflower rocks at White Pocket, Vermilion Cliffs National Monument, Arizona, USA [No model release; available only for editorial licensing]

Cracks in granite near Ropi Lake in the Desolation Wilderness, Eldorado National Forest, Sierra Nevada, California, USA

alabama snowflakes

Fallen Red Alder, Alnus rubra, in December, Olympic Peninsula, Washington State, USA

Quaking Aspen, Populus tremuloides, forest of bare branches along beginning of Wheeler Peak Summit Trail in Great Basin National Park, Nevada, USA

Dead (and dying) Purple Sea Urchin test (shell) at Tongue Point in Salt Creek Recreation Area along the Strait of Juan de Fuca, Olympic Peninsula, Washington State, USA

Small waterfall along the Dungeness River in, near the Upper Dungeness Trail in Olympic National Forest, Olympic Peninsula, Washington State, USA

Wind-blasted snow clinging to hardwood trees after a winter storm in Mecosta County, Michigan, USA

Wind rippling the surface of Snow Lake along Snow Lake Trail leading into the Alpine Lakes Wilderness, Mt. Baker–Snoqualmie National Forest, Washington State, USA

[Pseudotsuga menziesii]

Bubbles, created in winter by the photographer, rapidly form ice crystals on the inside surfaces, Michigan, USA,

A South African monkey beetle burrows into a Gazania flower.

Surface curtains of ice on the cliffs of Tettegouche State Park, where Lake Superior waves crash against the rock, leaving a layer of water that freezes, along the North Shore of Minnesota, USA

Parents analyze structure and function in objects from nature during interactive keynote STEM workshop for parents conducted by Dr. Diana Wehrell-Grabowski.

Trees and shadows at sunset on a winter day in downtown Battle Creek, Michigan, USA

Quaking Aspen, Populus tremuloides, forest of bare branches along beginning of Wheeler Peak Summit Trail in Great Basin National Park, Nevada, USA

Early light on Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Bark of dead conifer at Iceberg Lake in Ansel Adams Wilderness, Inyo National Forest, California, USA

Fallen cones of Limber Pine, Pinus flexilis, near Stella Lake along the Alpine Lakes Loop Trail in the Snake Range of Great Basin National Park, Nevada, USA

NC

[Pseudotsuga menziesii]

Sea ice near shore on a cove opening to the Atlantic Ocean in Newfoundland, Canada [No property release; available for editorial licensing only]

Framing the church spire are these tortured branches of old plane trees in the graveyard of St Giles' church, Camberwell. The churchyard is now basically a small park, with most gravestones placed along the edges.

Chain Fruit Cholla, Opuntia fulgida

The spectacular ice formations of Eben Ice Caves, Rock River Canyon Wilderness, Hiawatha National Forest, Michigan, USA

Closeup of spectacular ice formations of Eben Ice Caves, Rock River Canyon Wilderness, Hiawatha National Forest, Michigan, USA

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

A South African monkey beetle burrows into a Gazania flower.

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Hamma Hamma Living Legacy Trail dedicated to the accomplishments of the CCC Boys during the Great Depression, Olympic National Forest, Washington State, USA,