Our National Parks: Legacy at Risk, October 1994 National Geographic Magazine
Known as the crown jewels of the US. the National Parks system preserves land for public enjoyment and use, for wildlife and wilderness. In 1872, Yellowstone National Park was established as the world's first truly national park.The National Register of Historic Places is administered by the Park Service (with nearly 79,000 entries) and automatically includes all National Park System areas designated due to their historic significance. This includes all National Historical Parks/Historic...
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Fishermen in the Firehole River in Yellowstone...
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Aerials of Grand Prismatic Geyser. Yellowstone...
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Morning fog shrouds redwood trees. It is...
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Tourists in Yellowstone National Park feed a...
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A mountain goat crosses a parking lot at Logan...
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Lighthouse on Alcatraz Island near San...
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The view from top of tower on the Golden Gate...
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Reflections inside a guard house as a tourist...
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Young girl stays warm ducking into a bucket of...
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Women in period clothing watch soldiers...
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Sand dunes and fragile dune grasses glow from...
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Sand dunes and fragile dune grasses glow from...
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![Aerials of Grand Prismatic Geyser. Yellowstone is the nations first National Park, it spans three states and holds 70% of the world's geothermal activity.<br />
The vivid colors in the spring are the result of pigmented bacteria in the microbial mats that grow around the edges of the mineral-rich water. The bacteria produce colors ranging from green to red; the amount of color in the microbial mats depends on the ratio of chlorophyll to carotenoids. In the summer, the mats tend to be orange and red, whereas in the winter the mats are usually dark green.[5] The center of the pool is sterile due to extreme heat.<br />
The deep blue color of the water in the center of the pool results from a light-absorbing overtone of the hydroxy stretch of water.[6] Though this effect is responsible for making all large bodies of water blue, it is particularly intense in Grand Prismatic Spring because of the high purity and depth of the water in the middle of the spring.](http://cdn.c.photoshelter.com/img-get/I0000Kaqx5l4l2rA/t/200/I0000Kaqx5l4l2rA.jpg)
Aerials of Grand Prismatic Geyser. Yellowstone...
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Ranger Rick Hutchinson takes this specially...
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A path winds through a primeval world where...
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Gulls forage along the somber coast in Olympic...
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A brown bear on a hillside causes a "bear jam"...
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Buffalo in Yellowstone National Park....
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Steam Rises over the Firehole River in...
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Aerial of the Golden Gate Recreation Area's...
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Cars pass through a covered bridge on Pierce...
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A small island in the middle of Lake St. Mary...
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Japanese tourists visiting Yosemite National...
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Redwoods National Park was established in 1968...
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Cowboy drives cattle under Devil's Tower an...
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A park worker organizes mountains of laundry...
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Campers purchase firewood in boxes at the store...
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A French couple at the Sentinel Dome in...
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A small band plays taps at a Civil War...
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High mountains of Glacier National Park still...
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Rangers share a co-ed bathroom and brush their...
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The Maze area of Canyonlands National Park in...
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Rock formation in an area called the Needles in...
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More than 200 arches have been discovered...
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Rangers lead tours through Balcony House, a...
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A native woman keeps in the shade of her...
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A deer eats among in the lush meadows of Mesa...
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Rangers lead hikers through the challenging...
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Carl Sharmith, Yosemite National Park's oldest...
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Campers set up along the coastal highway in an...
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Morning push ups at the Presideo. The National...
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![A board walk tourists take to view geysers is engulfed in steam in Yellowstone National Park. Yellowstone is the nations first National Park, it spans three states.<br />
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.<br />
There are 300 geysers in Yellowstone and a total of at least 10,000 geothermal features altogether. Half the geothermal features and two-thirds of the world's geysers are concentrated in Yellowstone.[37]](http://cdn.c.photoshelter.com/img-get/I0000qFvxyjnHN.s/t/200/I0000qFvxyjnHN.s.jpg)
A board walk tourists take to view geysers is...
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Fire and smoke rise from Hawaii Volcanoes...
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Aerials of Hawaii Volcanoes National Park shows...
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![Steam sprews from a hot pool of water in Yellowstone, the nations first National Park spanning three states.<br />
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.<br />
There are 300 geysers in Yellowstone and a total of at least 10,000 geothermal features altogether. Half the geothermal features and two-thirds of the world's geysers are concentrated in Yellowstone.[37]](http://cdn.c.photoshelter.com/img-get/I0000_KjWbjQX1fA/t/200/I0000_KjWbjQX1fA.jpg)
Steam sprews from a hot pool of water in...
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A lone palm tree lines a rocky coast on the Big...
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Settling ponds from a phosphate mine outside...
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![Aerials of Grand Prismatic Geyser. Yellowstone is the nations first National Park, it spans three states and holds 70% of the world's geothermal activity.<br />
The vivid colors in the spring are the result of pigmented bacteria in the microbial mats that grow around the edges of the mineral-rich water. The bacteria produce colors ranging from green to red; the amount of color in the microbial mats depends on the ratio of chlorophyll to carotenoids. In the summer, the mats tend to be orange and red, whereas in the winter the mats are usually dark green.[5] The center of the pool is sterile due to extreme heat.<br />
The deep blue color of the water in the center of the pool results from a light-absorbing overtone of the hydroxy stretch of water.[6] Though this effect is responsible for making all large bodies of water blue, it is particularly intense in Grand Prismatic Spring because of the high purity and depth of the water in the middle of the spring.](http://cdn.c.photoshelter.com/img-get/I0000p_OIu0IiQIo/t/200/I0000p_OIu0IiQIo.jpg)
Aerials of Grand Prismatic Geyser. Yellowstone...
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Aerial of boiling water of Grand Prismatic, a...
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A park employee cleans Japanese graffiti off of...
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Japanese tourists visiting Yosemite National...
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Fishermen in the Firehole River in Yellowstone...
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Cowboy drives cattle under Devil's Tower an...
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Tourists are reflected in a car mirror at...
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Tourists cool off in a swimming pool located...
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Cowboy drives cattle under Devil's Tower an...
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Cowboy drives cattle silhouetted on the ridge...
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Cowboy drives cattle under Devil's Tower an...
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Cowboy rides along a river under Devils Tower,...
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Puffy white clouds and blue skies over Devils...
