Kevin Schafer / Rainbow over cliffs, Kalalau Valley, Na Pali Coast State Park, Kauai, Hawaii

Jeff Foott / Utah Juniper (Juniperus osteosperma) and cliff with desert varnish, Grand Staircase-Escalante National Monument, Utah

Jim Brandenburg / Cliff with lichen, Judd Lake, Superior National Forest, Minnesota

Tim Fitzharris / North Clear Creek Falls, Rio Grande National Forest, Colorado

Tim Fitzharris / Emerald Pool, Zion National Park, Utah

Kevin Schafer / Rainbow over cliffs, Kalalau Valley, Na Pali Coast State Park, Kauai, Hawaii

Tim Fitzharris / Colorado River in Glenwood Canyon, the upper layers of are sandstone the lower layers Cambrian rock, Colorado

Tim Fitzharris / Waterfall at Porphyry Basin, Colorado

Suzi Eszterhas / Rainbow and Piedras Blancos Lighthouse, Piedras Blancos coastline, California

Tim Fitzharris / Cliffs reflected in lake, Curecanti National Recreation Area, Colorado

Tim Fitzharris / Cliffs reflected in lake, Curecanti National Recreation Area, Colorado

Tim Fitzharris / Court of the Patriarchs, Zion National Park Utah