photo: Creative Commons
Flooding on the Saint John in 2008.
photo: Creative Commons
Panorama of the lower falls as seen from the artist's point.
photo: Creative Commons / Billy Hathorn
One of many smaller thermal pool at Yellowstone The Yellowstone Caldera is the largest volcanic system in North America. It has been termed a "supervolcano" because the caldera was formed by exceptionally large explosive eruptions.
photo: Creative Commons / Huge tif
Mount St. Helen's 1980 eruption
photo: Creative Commons / Kjkolb
Millerton Lake, the reservoir of Friant Dam and the largest on the San Joaquin mainstem. The bypass system starts with the Chinchilla's Canal Bypass, which can divert up to 5,500 cubic feet per second (160 m3/s) off the San Joaquin, a few miles above Mendota
photo: Creative Commons / Kevin
Punalu'u Black Sand Beach Park. The Hilina Slump is a 4,760 cubic mile (20,000 kilometer's) chunk of the big island of Hawaii on the south slope of the Kilauea volcano which is slipping away from the island.
photo: Creative Commons / Parklands cobbler
Niagra Falls
photo: Creative Commons / Finetooth
A clear small steam flows through a densely wooded forest. Bull Run River near its headwaters in Mount Hood National Forest
photo: Creative Commons
General Sherman, the largest tree in the world
photo: Creative Commons
Fog on a calm St. Johns River at the Shands Bridge near Green Cove Springs
photo: Creative Commons / Dontworry
Concrete factory at Osthafen in Frankfurt am Main Ostend Concrete plant facility (background) with concrete delivery trucks.
photo: Creative Commons
Mount Jefferson
photo: Creative Commons / Altair
UPS Airlines 757-200PF up to 15 containers or pallets, each measuring 88 by 125 inches (223 by 317 centimeters) at the base, can be accommodated on the main deck of the 757PF.
photo: Creative Commons / Pnw.hiker
Mount Adams southeast side, showing the heavily glaciated cirque. Adams is made of several overlapping cones that together form an 18-mile (29 km) diameter base which is elongated in its north-south axis and covers an area of 250 square miles (650 km2).
photo: Creative Commons / Flickr upload bot
Carbon Glacier is located on the north slope of Mount Rainier in the U.S. state of Washington and is the source of the Carbon River.
photo: Creative Commons / Rolfcosar
Lake Amatitlán
photo: Creative Commons / KVDP
Cement and sand ready to be mixed.
photo: Creative Commons / Siebrand
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of Seattle and 50 miles (80 km) northeast of Portland, Oregon.
photo: Creative Commons / Atarax42
A small shrine at Gaumukh, Gangotri glacier.
photo: Creative Commons / Doron
Khone Phapheng Falls
photo: Creative Commons
Lake Erie from satellite 2007. Photograph courtesy of NASA
photo: Creative Commons / Nk
Pouring a concrete floor for a commercial building, (slab-on-ground)
photo: Creative Commons / Alethe
Grimwith Reservoir
photo: GFDL / Stan Shebs
Gatun Lake
photo: Creative Commons / Alethe
Extended parapet of Grimwith Dam, north
photo: Creative Commons / Urdangaray
The Green River near Canyon lands National Park .The Green River, located in the western United States, is the chief tributary of the Colorado River.
photo: Creative Commons / Vmenkov
The water-carrying channel of the Tarragona Aqueduct
photo: Creative Commons
A modern building: Boston City Hall (completed 1968) is largely constructed of concrete, both pre-cast and poured-in-place.
photo: Creative Commons / Alethe
Grimwith House, from east, reef knolls beyond
photo: Creative Commons / Shaakunthala
Hummanaya - A blowhole located in Southern Province, Sri Lanka.