Glacier

Photograph of Wolverine Glacier: U.S. Geological Survey

Glaciers

Glacier at the head of Canon Fiord, Ellesmere Island, Canada.Glacier terminus: National Snow and Ice Data Center

Glaciers

McCall Glacier, photographed by Austin S. Post in 1958 (left) and by Matt Nolan in 2003 (right). From the Online glacier photograph database. Boulder, Colorado USA: National Snow and Ice Data Center/World Data Center for Glaciology. Digital media.

Glaciers

Muir Glacier, photographed by William O. Field on 13 August 1941 (left) and by Bruce F. Molnia on 31 August 2004 (right). From the Online glacier photograph database. Boulder, Colorado USA: National Snow and Ice Data Center/World Data Center for Glaciology. Digital media.

Glaciers

Qori Kalis Glacier, photographed by Lonnie G. Thompson (1978 and 2004), Byrd Polar Research Center, The Ohio State University. From the Online glacier photograph database. Boulder, Colorado USA: National Snow and Ice Data Center/World Data Center for Glaciology. Digital media.

It’s a Force, Of Course

Windy day at Ft. Irwin. Photo by Tony Troxler, USGS.

It’s a Force, Of Course

Kelso Dunes in the Mojave National Preserve. Photo by David Miller, USGS.

It’s a Force, Of Course

Guadalupe Mountains National Park. View of El Capitan, USGS.

It’s a Force, Of Course

Mushroom Rock. Theories of formation include wind erosion. USGS.

It’s a Force, Of Course

Before and after pictures, Cowells Beach. USGS.

It’s a Force, Of Course

Floodwaters. USGS.

It’s a Force, Of Course

San Antonio. Cibolo Creek. Bob McMillan FEMA Photo

It’s a Force, Of Course

Soil erosion. USDA

It’s a Force, Of Course

Grand Canyon. USGS