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Spring issuing from karst-weathered limestone, Crete, Greece (180328-60)
Exposed water table (Spokane Aquifer) in quarry, Spokane, Washington (150705-38)
Spring water issuing from basaltic lava flows at Tamolitch Pool on the McKenzie River, Oregon. (171016-16f)
Aerial view of gravel quarry, California. Note that it intersects the ground water table. (res-29)
Water monitoring of spring at Devils Hole, Mojave Desert, California. (IMG_5237)
Spring issuing from base of glacial till, southern Alberta, Canada. (G-26)
Groundwater staining along fractures in granitic rock, Sierra Nevada, California
Cave Formations, or speleothems, form by precipitation of calcite from groundwater. Stalagmite, stalactites, and columns, Oregon Caves National Monument, Oregon. (G-17c)
Hot Spring and sinter deposits, Yellowstone National Park, Wyoming. (G-09)
Springs midway down alluvial fan, Furnace Creek, Death Valley National Park, California.
Badwater Spring issues from a recently active fault along the front of the Black Mountains, visible as two fault scarps in the background on the alluvial fan (G-04)
Sinter (silica) deposits and hot spring, Yellowstone National Park, Wyoming. Photo is about 1.5 meters across. (5D-6435)
Aerial view of crop circles in Idaho (30-7980)
Irrigation of potato fields, Idaho. (30-0858)
Aerial view of circular sinkhole in central Florida. Sinkholes form by dissolution and collapse of underlying limestone bedrock. The water level marks the groundwater table. (140308-60)