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Rockhole
A panhole is a depression or basin eroded into flat or gently sloping cohesive rock.Twidale, C.R., and Bourne, J.A., 2018''Rock basins (gnammas) revisited. ''Géomorphologie: Relief, Processus, Environnement, Articles sous presse, Varia, mis en ligne le 08 janvier 2018, consulté le 01 juillet 2018. Similar terms for this feature are gnamma or rock holes (Australia), armchair hollows, weathering pans (or pits) and solution pans (or pits).Hughes, Kebbi A., 2012''Bacterial Communities and their Influence on the Formation and Development of Potholes in Sandstone Surfaces of the Semi-Arid Colorado Plateau''University of Western Ontario - Electronic Thesis and Dissertation Repository. Paper 543. Some authors refer to panholes also as potholes, which is a term typically used for similarly shaped riverine landforms. In fluvial geomorphology, the term ''pothole'' is typically used for a smooth, bowl-shaped or cylindrical hollow, generally deeper than wide, found developed in the rocky be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weathering Pits - Granitic Rock - Glacier Point, Yosemite National Park, California
Weathering is the deterioration of rocks, soils and minerals as well as wood and artificial materials through contact with water, atmospheric gases, and biological organisms. Weathering occurs ''in situ'' (on site, with little or no movement), and so is distinct from erosion, which involves the transport of rocks and minerals by agents such as water, ice, snow, wind, waves and gravity. Weathering processes are divided into ''physical'' and ''chemical weathering''. Physical weathering involves the breakdown of rocks and soils through the mechanical effects of heat, water, ice, or other agents. Chemical weathering involves the chemical reaction of water, atmospheric gases, and biologically produced chemicals with rocks and soils. Water is the principal agent behind both physical and chemical weathering, though atmospheric oxygen and carbon dioxide and the activities of biological organisms are also important. Chemical weathering by biological action is also known as biological wea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stone Mountain (North Carolina)
Stone Mountain is the centerpiece of Stone Mountain State Park. It is a dome of exposed granite (specifically a quartz diorite to granodiorite) of Devonian age, which has intruded into the gneiss of the Precambrian Alligator Back Formation. It rises sharply over 600 feet (183 m) above the surrounding terrain. The mountain, which has an elevation of 2,305 feet (706 m) above sea level, is known for its barren sides and distinctive brown-gray color, and can be seen for miles. The mountain offers some of the best rock climbing in North Carolina, and the park's creeks and streams feature excellent brook trout fishing. Because the mountain is the best example of a monadnock in massive granite in North Carolina it was designated a National Natural Landmark The National Natural Landmarks (NNL) Program recognizes and encourages the conservation of outstanding examples of the natural history of the United States. It is the only national natural areas program that ident ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stone Mountain
Stone Mountain is a quartz monzonite dome Inselberg, monadnock and the site of Stone Mountain Park, east of Atlanta, Georgia. Outside the park is the small city of Stone Mountain, Georgia. The park is the most visited tourist site in the state of Georgia. The park is owned by the state of Georgia (U.S. state), Georgia and is currently managed by Herschend Family Entertainment. At its summit, the elevation is AMSL, above sea level and above the surrounding area. Stone Mountain is well known for not only its geology, but also the enormous rock relief on its north face, the largest bas-relief artwork in the world.Stone Mountain ." ''georgia.gov,'' retrieved February 2007. The carving, completed in 1972, depicts three Confederate States of America, Confederate leaders, Jefferson Davis, Rob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shenandoah National Park
Shenandoah National Park (often ) is an American national park that encompasses part of the Blue Ridge Mountains in the Commonwealth of Virginia. The park is long and narrow, with the Shenandoah River and its broad valley to the west, and the rolling hills of the Virginia Piedmont to the east. Skyline Drive is the main park road, generally traversing along the ridgeline of the mountains. Almost 40% of the park's land——has been designated as wilderness areas and is protected as part of the National Wilderness Preservation System. The highest peak is Hawksbill Mountain at . Park purpose As stated in the foundation document: Geography The park encompasses parts of eight counties. On the west side of Skyline Drive they are, from northeast to southwest, Warren, Page, Rockingham, and Augusta counties. On the east side of Skyline Drive they are Rappahannock, Madison, Greene, and Albemarle counties. The park stretches for along Skyline Drive from near the town of Front Roy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navajo National Monument
Navajo National Monument is a National Monument located within the northwest portion of the Navajo Nation territory in northern Arizona, which was established to preserve three well-preserved cliff dwellings of the Ancestral Puebloan people: Keet Seel (Broken Pottery) (), Betatakin (Ledge House) (), and Inscription House (). The monument is high on the Shonto plateau, overlooking the Tsegi Canyon system, west of Kayenta, Arizona. It features a visitor center with a museum, three short self-guided trails, two small campgrounds, and a picnic area. The Sandal Trail is an accessible self-guided roundtrip trail that ends at an overlook of the Betatakin ruins across the 560-foot-deep (170 m) Betatakin Canyon. The overlook is the only point in the monument where visitors can view the cliff dwelling other than on the guided tours. Rangers guide visitors on free (3-5 hour long) tours of the Betatakin cliff dwellings and on roundtrip back-country hikes to the Keet Seel. The Inscription ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacier Point
Glacier Point is a viewpoint above Yosemite Valley in the U.S. state of California. It is located on the south wall of Yosemite Valley at an elevation of , above Curry Village. The point offers a superb view of several of Yosemite National Park's well-known landmarks, including Yosemite Valley, Yosemite Falls, Half Dome, Vernal Fall, Nevada Fall, and Clouds Rest. Between 1872 and 1968, it was the site of the Yosemite Firefall. Geology The extreme point of the promontory of Glacier Point is wholly bare, but on the slopes below, in the hollow to the west, and on the wooded slope above, glacial material is abundant. Its glacial origin is definitely proved by the presence in it of rocks derived from Little Yosemite Valley and the Sierra Nevada. There are three types of glacially-deposited rock at Glacier Point: #Most plentiful are rounded boulders and cobbles and angular fragments, all deeply weathered, of Half Dome quartz monzonite, the light-colored granite of which not only Half ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forbes State Forest
Forbes State Forest is a Pennsylvania state forest in Pennsylvania Bureau of Forestry District #4. The main offices are located in Laughlintown in Westmoreland County, Pennsylvania in the United States. Mount Davis, the highest peak in Pennsylvania, is located in the forest. The forest was named in honor of General John Forbes. It includes 20 separate tracts of land and covers over that stretch across Fayette, Somerset, and Westmoreland Counties. The designated forest tracts generally follow one of the area's dominant terrain features, Laurel Ridge, part of the Laurel Highlands. History Forbes State Forest was formed as a direct result of the depletion of the forests of Pennsylvania that took place during the mid-to-late 19th century. Conservationists like Dr. Joseph Rothrock became concerned that the forests would not regrow if they were not managed properly. Lumber and iron companies had harvested the old-growth forests for various reasons. They clear cut the forest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hiltaba Nature Reserve
Hiltaba Nature Reserve is located in the north of the Eyre Peninsula on the western edge of the Gawler Ranges, South Australia. It is situated on a former pastoral lease known as Hiltaba, or Hiltaba Station, that had operated as a sheep station. It is owned by the Nature Foundation, who purchased the property in 2012. History The traditional owners of the Gawler Ranges are the Barngarla, Kokatha and Wirangu peoples, who have inhabited the area for at least 30,000 years and are known collectively as the Gawler Ranges Aboriginal People. Text may have been copied from this source, which is available under Attribution 4.0 International (CC BY 4.0)licence. The tribal land of a man called "Whipstick Billy", who was "one of the last Gawler Ranges natives" still alive by around 1910, was said to have been centred on Hiltaba. Around 1844, John Charles Darke explored the region, using an ox-drawn cart (known as a bullock dray in Australia). Around 1857, Aboriginal guides led a go ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tautology (language)
In literary criticism and rhetoric, a tautology is a statement that repeats an idea, using near-synonymous morphemes, words or phrases, effectively "saying the same thing twice". Tautology and pleonasm are not consistently differentiated in literature. Like pleonasm, tautology is often considered a fault of style when unintentional. Intentional repetition may emphasize a thought or help the listener or reader understand a point. Sometimes logical tautologies like "Boys will be boys" are conflated with language tautologies, but a language tautology is not inherently true, while a logical tautology always is. Etymology The word was coined in Hellenistic Greek from ('the same') plus ('word' or 'idea'), and transmitted through 3rd-century Latin and French . It first appeared in English in the 16th century. The use of the term logical tautology was introduced in English by Wittgenstein in 1919, perhaps following Auguste Comte's usage in 1835. Examples * "Only time will tell if w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Australia
Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to the south, the Northern Territory to the north-east, and South Australia to the south-east. Western Australia is Australia's largest state, with a total land area of . It is the second-largest country subdivision in the world, surpassed only by Russia's Sakha Republic. the state has 2.76 million inhabitants percent of the national total. The vast majority (92 percent) live in the south-west corner; 79 percent of the population lives in the Perth area, leaving the remainder of the state sparsely populated. The first Europeans to visit Western Australia belonged to the Dutch Dirk Hartog expedition, who visited the Western Australian coast in 1616. The first permanent European colony of Western Australia occurred following the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aboriginal Australian
Aboriginal Australians are the various Indigenous peoples of the Australian mainland and many of its islands, such as Tasmania, Fraser Island, Hinchinbrook Island, the Tiwi Islands, and Groote Eylandt, but excluding the Torres Strait Islands. The term Indigenous Australians refers to Aboriginal Australians and Torres Strait Islanders collectively. It is generally used when both groups are included in the topic being addressed. Torres Strait Islanders are ethnically and culturally distinct, despite extensive cultural exchange with some of the Aboriginal groups. The Torres Strait Islands are mostly part of Queensland but have a separate governmental status. Aboriginal Australians comprise many distinct peoples who have developed across Australia for over 50,000 years. These peoples have a broadly shared, though complex, genetic history, but only in the last 200 years have they been defined and started to self-identify as a single group. Australian Aboriginal identity has cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
