Groundwater

Soda straw stalactites and column, Carlsbad Caverns, NM	(GW2) Temple of the Sun, a large column, Carlsbad Caverns National Park, NM	(GW3) The Queen's Draperies, a drip curtain, Carlsbad Caverns National Park, NM	(GW4) Cave popcorn on a stalactite, Carlsbad Caverns National Park, NM
Giant Dome, a large column, Carlsbad Caverns National Park, NM	(GW6) Column, stalactite, stalagmite, Carlsbad Caverns Ntional Park, NM	(GW7) Stalactites, draperies, and flowstone, Carlsbad Caverns National Prk, NM	(GW8) Castle Geyser, Yellowstone National Park, WY
(GW9) Tufa pinacles and tufa encrusted rock, Mono Lake, CA	(GW10) Paleosinkhole in Galena Fm., Galena, IL	(GW11) Minerva Hot Springs, Yellowstone National Park, WY	(GW12) Grand prismatic spring, Yellowstone National Park, WY
(GW13) Numerous dolines in karst topography near Park City, KY	(GW14) Large sinkhole at Bottomless Lakes State Park, NM	(GW15) Irrigation system	(GW16) Irrigation system
(GW17) Mammoth Hot Springs, Yellowstone National Park, WY	(GW18) Sinkhole in Winterhaven, FL	(GW19) Castle geyser erupting, Yellowstone Ntional Park, WY	(GW20) The Doll House, Carlsbad Caverns National Park, NM