Erosion

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.

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

Guadalupe Mountains National Park. View of El Capitan, USGS. It’s a Force, Of Course Guadalupe Mountains National Park. View of El Capitan, USGS.

Mushroom Rock. Theories of formation include wind erosion. USGS. It’s a Force, Of Course Mushroom Rock. Theories of formation include wind erosion. USGS.

Before and after pictures, Cowells Beach. USGS. It’s a Force, Of Course Before and after pictures, Cowells Beach. USGS.

It’s a Force, Of Course Floodwaters. USGS.

San Antonio. Cibolo Creek. Bob McMillan FEMA Photo 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