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Thermal activity, Norris Geyser Basin area, Yellowstone National Park.
Porkchop Geyser's name derives from its pork chop-shaped sinter mound. Measuring around 2 feet in diameter, the geyser was once a tranquil hot spring until 1971 when it began erupting intermittently. In 1989, it experienced a violent hydrothermal explosion, scattering debris over 200 feet away and significantly altering its appearance. In that year, a visitor named David Kirwan died after attempting to rescue his friend's dog from the hot spring.
Lion Geyser Group hot springs in Yellowstone National Park
Image of Dry geyser holes surrounded in moss at Yellowstone basin in winter
The Great Plains meet the Rocky Mountains in Wyoming. The state is a great plateau broken by a number of important mountain ranges. In the northwest are the Absaroka, the Owl Creek, Wyoming, Gros Ventre, Wind River and the Teton ranges. In the north central are the Big Horns; in the northeast, the Black Hills; and in the southern portion of Wyoming, the Laramie, Medicine Bow and Sierra Madre ranges.
Hot spring and geyser with deep aqua cave and wilderness background at Yellowstone National Park, USA.
Fountain Paint Pot in Yellowstone National Park, USA
low level geyser at Yellowstone NP
Geyser near Old Faithul Geyser at Yellowstone national Park.
Most popular geyser in the world, the Old Faithful geyser in the Yellowstone National Park. USA.
Image of Geysers in Yellowstone Biscuit Basin during winter
Old Faithful Geyser in Yellowstone National Park
Cliff Geyser on Iron Spring Creek at Black Sand Basin on Upper Geyser Basin in Yellowstone National Park, Wyoming
Morning Glory Pool - Yellowstone - August 1993.  Scanned from Kodachrome slide.
Yellowstone NP nature
Yellowstone National Park’s thermal features can be seen as the product of millions of years of geology at work.  Geysers are hot springs that erupt periodically. The eruptions is the result of super-heated water below-ground becoming trapped in channels leading to the surface.
Old Faithful, Upper Geyser Basin, Yellowstone National Park, USA
Yellowstone National Park thermal pool
Image of Yellowstone in winter with acidic colorful pools and steam
Iron Spring Creek at Black Sand Basin in Upper Geyser Basin of Yellowstone National Park in Park County, Wyoming
Close-up of the pot of gold inside Yellowstone
Vibrant geyser
Yellowstone, Wyoming, USA - July 23, 1995: tourists awaiting the eruption of water and steam of the famous and regular Old Faithful Geyser.
Thermal spring, one of many nature wonders in the Yellowstone National Park, Wyoming, USA. Feature created over thousands of years as hot water from the spring cooled and deposited colorful calcium carbonate.
Shell spring of Biscuit Basin, Scenic Landscapes of Geothermal activity of Yellowstone National Park USA
Scenery at Upper Geyser Basin, Yellowstone National Park, Wyoming, USA
Free Images: "bestof:NorthernSectionUpperGeyserBasinGiantJPG.jpg en Northern section of Upper Geyser Basin Yellowstone National Park with Giant Geyser annotated Screen captured from"
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