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Water Gap
A water gap is a gap that flowing water has carved through a mountain range or mountain ridge and that still carries water today. Such gaps that no longer carry water currents are called wind gaps. Water gaps and wind gaps often offer a practical route for road and rail transport to cross the mountain barrier. Geology A water gap is usually an indication of a river that is older than the current topography. The likely occurrence is that a river established its course when the landform was at a low elevation, or by a rift in a portion of the crust of the earth having a very low stream gradient and a thick layer of unconsolidated sediment. In a hypothetical example, a river would have established its channel without regard for the deeper layers of rock. A later period of uplift would cause increased erosion along the riverbed, exposing the underlying rock layers. As the uplift continued, the river, being large enough, would continue to erode the rising land, cutting thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
View From Wallula Main Street IMG 1480
Acornsoft was the software arm of Acorn Computers, and a major publisher of software for the BBC Micro and Acorn Electron. As well as games, it also produced a large number of educational titles, extra computer languages and business and utility packages – these included word processor ''VIEW'' and the spreadsheet ''ViewSheet'' supplied on ROM and cartridge for the BBC Micro/Acorn Electron and included as standard in the BBC Master and Acorn Business Computer. History Acornsoft was formed in late 1980 by Acorn Computers directors Hermann Hauser and Chris Curry, and David Johnson-Davies, author of the first game for a UK personal computer and of the official Acorn Atom manual "Atomic Theory and Practice". David Johnson-Davies was managing director and in early 1981 was joined by Tim Dobson, Programmer and Chris Jordan (designer), Chris Jordan, Publications Editor. While some of their games were clones or remakes of popular arcade games (e.g. ''Hopper'' is a clone of Sega's ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stream Capture
Stream capture, river capture, river piracy or stream piracy is a geomorphological phenomenon occurring when a stream or river drainage system or watershed is diverted from its own bed, and flows down to the bed of a neighbouring stream. This can happen for several reasons, including: *Tectonic earth movements, where the slope of the land changes, and the stream is tipped out of its former course *Natural damming, such as by a landslide or ice sheet *Erosion, either ** Headward erosion of one stream valley upwards into another, or **Lateral erosion of a meander through the higher ground dividing the adjacent streams. **Within an area of karst topography, where streams may ''sink'', or flow underground (a sinking or losing stream) and then reappear in a nearby stream valley *Glacier retreat The cause is not always clear. The additional water flowing down the capturing stream may accelerate erosion and encourage the development of a canyon (gorge). The now-dry valley of the o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heavitree Gap
The Heavitree Gap, or ''Ntaripe'' in the Arrernte language, is a water gap in the Northern Territory of Australia in the MacDonnell Ranges. It is the southern entrance to the city of Alice Springs and in addition to the Todd River it carries the main road and rail access to the south. The Gap is an important sacred site for the Arrernte people and its use as a thoroughfare was avoided by women prior to the construction of the road and later Central Australia Railway The former Central Australia Railway, which was built between 1878 and 1929 and dismantled in 1980, was a Narrow-gauge railway, 1067 mm narrow gauge railway between Port Augusta railway station, Port Augusta and Alice Springs. A standard gau .... The Gap was named by William Mills, the Overland Telegraph line surveyor who discovered the location for Alice Springs. It was named after his former school in Heavitree, Devon. On the southwest side of The Gap is the historic Heavitree Gap Police Station. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bay Of Fundy
The Bay of Fundy () is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the U.S. state of Maine. It is an arm of the Gulf of Maine. Its tidal range is the highest in the world. The bay was named ''Bakudabakek'' by the indigenous Mi'kmaq and Passamaquoddy groups, meaning "open way". The Wolastoqiyik peoples named it ''Wekwabegituk'', meaning "waves at the head of the bay". The name "Fundy" has been speculated to have derived from the French word ("split") or ("head of the bay"). Some individuals have disputed this, including William Francis Ganong, who suggested that the name likely derived from Portuguese origin instead, specifically regarding João Álvares Fagundes, who may have referred to the bay as ("Great Bay") and nearby waters as ("deep river"). Hydrology Tides The tidal range in the Bay of Fundy is about ; the average tidal range worldwide is only . Some tides are higher than others, depending on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annapolis River
The Annapolis River () is a Canadian river located in Nova Scotia's Annapolis Valley. Geography Measuring 120 kilometres in length, the river flows southwest through the western part of the valley from its source in Caribou Bog (50 m [160 ft] above sea level) near the villages of Aylesford, Nova Scotia, Aylesford and Berwick, Nova Scotia, Berwick in western Kings County, Nova Scotia, Kings County, to its mouth near Clementsport where it empties into the Annapolis Basin. The estuary portion of the Annapolis River runs from Bridgetown, Nova Scotia, Bridgetown to near Clementsport and experiences a tidal range of approximately between tides. The eastern part of the Annapolis Valley is drained by the Cornwallis River, also rising in the Caribou Bog, which has been dated to 10,000 years old. According to estimates by the Province of Nova Scotia, there were 31,877 people resident within the Annapolis River watershed in 2011. The river flows through some of the most productive agr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nova Scotia
Nova Scotia is a Provinces and territories of Canada, province of Canada, located on its east coast. It is one of the three Maritime Canada, Maritime provinces and Population of Canada by province and territory, most populous province in Atlantic Canada, with an estimated population of over 1 million as of 2024; it is also the second-most densely populated province in Canada, and second-smallest province by area. The province comprises the Nova Scotia peninsula and Cape Breton Island, as well as 3,800 other coastal islands. The province is connected to the rest of Canada by the Isthmus of Chignecto, on which the province's land border with New Brunswick is located. Nova Scotia's Capital city, capital and largest municipality is Halifax, Nova Scotia, Halifax, which is home to over 45% of the province's population as of the 2021 Canadian census, 2021 census. Halifax is the List of census metropolitan areas and agglomerations in Canada, twelfth-largest census metropolitan area in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digby Gut
The Digby Gut is a narrow channel connecting the Bay of Fundy with the Annapolis Basin. The town of Digby, Nova Scotia is located on the inner portion of the western side of the Gut. The eastern entrance is marked by the Point Prim Lighthouse. Strong tidal currents, numerous rocky ledges, frequent fogs and unpredictable winds make it a dangerous passage requiring a pilot or local knowledge to navigate. Tide flows create 5 knot (unit), knot tidal currents and create numerous whirlpools and eddies. The gut, technically referred to as a water gap, is about a half nautical mile in width and bordered by high rocky cliffs. It marks a break in the North Mountain (Nova Scotia), North Mountain ridge along the Annapolis Valley and is the eastern end of Digby Neck. Digby Gut had its origins as the northern terminus of the ancient Bear River (Nova Scotia), Bear River, part of which is now a drowned river valley. Digby Gut is overlooked by the Digby Pines Resort and has been used daily for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delaware Water Gap
The Delaware Water Gap is a water gap on the border of the U.S. states of New Jersey and Pennsylvania where the Delaware River cuts through a large ridge of the Appalachian Mountains. The gap makes up the southern portion of the Delaware Water Gap National Recreation Area, which is used primarily for recreational purposes, such as canoeing, fishing, hiking, and rock climbing. Though the US National Park Service manages the National Recreation Area, portions of the water gap are also patrolled by New Jersey Division of Parks and Forestry. The park does not charge an entrance fee but does have expanded amenity fees, including vehicle season and daily passes, bicycles amenity fees, and charges for beach use. Most of the park is open 24-hours a day, with most day-use areas within the park open sunrise to sunset (such as trailhead parking lots, Millbrook Village, and all picnic areas). Geology A water gap is a geological feature where a river cuts through a mountain ridge. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cumberland Narrows
The Cumberland Narrows (or simply The Narrows) is a water gap in western Maryland in the United States, just west of Cumberland. Wills Creek cuts through the central ridge of the Wills Mountain Anticline at a low elevation here between Wills Mountain to the north and Haystack Mountain to the south. Cliffs and talus of the two mountains' Tuscarora quartzite caprock are prominent within the Narrows. A prominent rocky outcropping at the south end of Wills Mountain in the Cumberland Narrows is known as Lover's Leap. The geological features of the Narrows provide Cumberland a western backdrop of the two mountains with a narrow gap between them. Geography The Cumberland Narrows serves as a western gateway from Cumberland to the Appalachian Plateau and the Ohio River Valley beyond. Nemacolin's Path, which later became Old National Road and is now Alternate U.S. 40, passes through the Narrows, along with the former Baltimore and Ohio Railroad's main line between Balti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallula Gap
Wallula Gap () is a large water gap of the Columbia River in the Northwestern United States, in Southeastern Washington. It cuts through the Horse Heaven Hills basalt anticlines in the Columbia River Basin, just south of the confluence of the Walla Walla and Columbia rivers. The National Park Service has recognized the gap as a National Natural Landmark, as a site that provides an important illustration of the geological history of the United States. Geology Flood basalts In southeastern Washington, Eastern Oregon, and southern Idaho, flood basalt flows of extremely fluid basaltic lava spread in all directions from long fissures, building broad fields of gently sloping lava that spread widely over great distances. Along the Snake River in Idaho, and the Columbia River in Washington and Oregon, these lava flows have been extensively exposed by erosion (with extensive displays of columnar basalt), and measure almost in total thickness. The basalts flows which are visible ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbia River Gorge
The Columbia River Gorge is a canyon of the Columbia River in the Pacific Northwest of the United States. Up to deep, the canyon stretches for over as the river winds westward through the Cascade Range, forming the boundary between the state of Washington to the north and Oregon to the south. Extending roughly from the confluence of the Columbia with the Deschutes River (and the towns of Roosevelt, Washington, and Arlington, Oregon) in the east down to the eastern reaches of the Portland metropolitan area, the water gap furnishes the only navigable route through the Cascades and the only water connection between the Columbia Plateau and the Pacific Ocean. It is thus that the routes of Interstate 84, U.S. Route 30, Washington State Route 14, and railroad tracks on both sides run through the gorge. A popular recreational destination, the gorge holds federally protected status as the Columbia River Gorge National Scenic Area and is managed by the Columbia River Gorge Commis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saddle Point
In mathematics, a saddle point or minimax point is a Point (geometry), point on the surface (mathematics), surface of the graph of a function where the slopes (derivatives) in orthogonal directions are all zero (a Critical point (mathematics), critical point), but which is not a local extremum of the function. An example of a saddle point is when there is a critical point with a relative minimum along one axial direction (between peaks) and a relative maxima and minima, maximum along the crossing axis. However, a saddle point need not be in this form. For example, the function f(x,y) = x^2 + y^3 has a critical point at (0, 0) that is a saddle point since it is neither a relative maximum nor relative minimum, but it does not have a relative maximum or relative minimum in the y-direction. The name derives from the fact that the prototypical example in two dimensions is a surface (mathematics), surface that ''curves up'' in one direction, and ''curves down'' in a different dir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
