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Abkhaz Range
Abkhaz Ridge or Chkhalta Ridge ( ab , Aҧsnytәi ashkhaӡқua, '' Apsnytvi ridge ''; ka , აფხაზეთის ქედი, '' Apkhazetiskedi '' Instructions for the Russian transfer of geographical names of the Georgian SSR. - M., 1972. - P. 10.) — mountain range in Abkhazia, on the southern slopes of Greater Caucasus. Ridge provides drainage divide between the Chkhalta River drainage basin and basins of the Amtkeli, Jambali, Kuabchari and Zimi rivers. Geography The ridge serves as an eastern continuation of the Bzyb Range, from which it is separated by a low cofferdam pass Amtkel, in the area of which the river Kelasur begins, the valley of which separates southern spurs of two ridges. It stretches in accordance with the direction of folding parallel to the Main Caucasian (Dividing) ridge, from which it is separated by the upper reaches of the Bzyb River and the valley Chkhalta River. The length of the ridge is about 60 km, the height is up to 3026 m. N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Amtkeli
__NOTOC__ Lake Amtkeli or Amtkel ( ka, ამტყელის ტბა; ) is a lake in the Gulripshi District of Abkhazia, Georgia (country), Georgia that was formed on 3 October 1891 when an earthquake caused a landslide on the south-western slope of Mt. little Shkhapach into the valley of the Amtkeli River. Geography Lake Amtkeli is fed by the Amtkeli River, but only a small part of its water percolates through the obstructing rubble back into the river. The greater part leaves the lake through underground passages to the Jampali River. Due to the lake's limited discharge capacity, its water level rises strongly during snowmelt in May, leading to annual fluctuations of up to in the lake's average height above sea level and maximal depth, and increasing its length from to . The average surface area of Lake Amtkeli is , and its drainage basin measures . Due to the lake's origin, its underwater slopes are steep, following the surface slopes. Environment Lake Amtkeli is home ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GeoNames
GeoNames (or GeoNames.org) is a user editable geographical database available and accessible through various web services, under a Creative Commons attribution license. The project was founded in late 2005. The GeoNames dataset differs from, but includes data from, the US Government's similarly named GEOnet Names Server. Database and web services The GeoNames database contains over 25,000,000 geographical names corresponding to over 11,800,000 unique features. All features are categorized into one of nine feature classes and further subcategorized into one of 645 feature codes. Beyond names of places in various languages, data stored include latitude, longitude, elevation, population, administrative subdivision and postal codes. All coordinates use the World Geodetic System 1984 ( WGS84). Those data are accessible free of charge through a number of Web services and a daily database export. Wiki interface The core of GeoNames database is provided by official public ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gagra Range
Gagra Range (; ka, გაგრის ქედი, tr; russian: Гагрский хребет, Gagrskij hrebet) is a mountain range of the Greater Caucasus in Abkhazia, Georgia.The range runs between the valleys of the Bzyb and Psou rivers to the south of the Caucasus Major, in a general North-South direction. The highest elevation is 3,357 m (Mount Agepsta). The Gagra Range approaches the Black Sea close to the city of Gagra and plays an important role in moderating the climate of that resort by blocking cold, continental winds from the north and east. The range is mostly made up of limestone, with pronounced karst topography and is characterized by many deep canyons created by rivers. The deepest cave in the world, the Veryovkina Cave, is located in the Arabika Massif of the Gagra Range. A highway to Lake Ritsa runs by the range, along the Bzyb, Iupshara and Gega rivers. See also *Bzyb Range *Kodori Range Kodori range ( ka, კოდორის ქედი, tr) is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave
A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea caves, rock shelters, and grottos, that extend a relatively short distance into the rock and they are called ''exogene'' caves. Caves which extend further underground than the opening is wide are called ''endogene'' caves. Speleology is the science of exploration and study of all aspects of caves and the cave environment. Visiting or exploring caves for recreation may be called ''caving'', ''potholing'', or ''spelunking''. Formation types The formation and development of caves is known as '' speleogenesis''; it can occur over the course of millions of years. Caves can range widely in size, and are formed by various geological processes. These may involve a combination of chemical processes, erosion by water, tectonic forces, microorgan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karst
Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. Subterranean drainage may limit surface water, with few to no rivers or lakes. However, in regions where the dissolved bedrock is covered (perhaps by debris) or confined by one or more superimposed non-soluble rock strata, distinctive karst features may occur only at subsurface levels and can be totally missing above ground. The study of ''paleokarst'' (buried karst in the stratigraphic column) is important in petroleum geology because as much as 50% of the world's hydrocarbon reserves are hosted in carbonate rock, and much of this is found in porous karst systems. Etymology The English word ''karst'' was borrowed from German in the late 19th century, which entered German ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beech
Beech (''Fagus'') is a genus of deciduous trees in the family Fagaceae, native to temperate Europe, Asia, and North America. Recent classifications recognize 10 to 13 species in two distinct subgenera, ''Engleriana'' and ''Fagus''. The ''Engleriana'' subgenus is found only in East Asia, distinctive for its low branches, often made up of several major trunks with yellowish bark. The better known ''Fagus'' subgenus beeches are high-branching with tall, stout trunks and smooth silver-grey bark. The European beech ('' Fagus sylvatica'') is the most commonly cultivated. Beeches are monoecious, bearing both male and female flowers on the same plant. The small flowers are unisexual, the female flowers borne in pairs, the male flowers wind-pollinating catkins. They are produced in spring shortly after the new leaves appear. The fruit of the beech tree, known as beechnuts or mast, is found in small burrs that drop from the tree in autumn. They are small, roughly triangular, and edib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spruce
A spruce is a tree of the genus ''Picea'' (), a genus of about 35 species of coniferous evergreen trees in the family Pinaceae, found in the northern temperate and boreal ( taiga) regions of the Earth. ''Picea'' is the sole genus in the subfamily Piceoideae. Spruces are large trees, from about 20 to 60 m (about 60–200 ft) tall when mature, and have whorled branches and conical form. They can be distinguished from other members of the pine family by their needles (leaves), which are four-sided and attached singly to small persistent peg-like structures ( pulvini or sterigmata) on the branches, and by their cones (without any protruding bracts), which hang downwards after they are pollinated. The needles are shed when 4–10 years old, leaving the branches rough with the retained pegs. In other similar genera, the branches are fairly smooth. Spruce are used as food plants by the larvae of some Lepidoptera (moth and butterfly) species, such as the eastern spru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mica Schist
Schist ( ) is a medium-grained metamorphic rock showing pronounced schistosity. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. This texture reflects a high content of platy minerals, such as micas, talc, chlorite, or graphite. These are often interleaved with more granular minerals, such as feldspar or quartz. Schist typically forms during regional metamorphism accompanying the process of mountain building (orogeny) and usually reflects a medium grade of metamorphism. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs. Schist metamorphosed from mudstone is particularly common and is often very rich in mica (a ''mica schist''). Where the type of the original rock (the protolith) is discernible, the schist is usually given a name reflecting its protolith, such as ''schistose me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jura (geology)
The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of the Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic Magmatic Province. The beginning of the Toarcian Stage started around 183 million years ago and is marked by an extinction event associated with widespread oceanic anoxia, ocean acidification, and elevated temperatures likely caused by the eruption of the Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear boundary with the Cretaceous and is the only boundary between geological periods to remain formally undefined. By the beginning of the Jurassic, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porphyry (geology)
Porphyry ( ) is a textural term for an igneous rock consisting of coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass. The larger crystals are called phenocrysts. In its non-geologic, traditional use, the term ''porphyry'' refers to the purple-red form of this stone, valued for its appearance. The term ''porphyry'' is from the Ancient Greek (), meaning "purple". Purple was the color of royalty, and the "imperial porphyry" was a deep purple igneous rock with large crystals of plagioclase. Some authors claimed the rock was the hardest known in antiquity. Thus, "imperial"-grade porphyry was prized for monuments and building projects in Imperial Rome and thereafter. Subsequently, the name was given to any igneous rocks with large crystals. The adjective ''porphyritic'' now refers to a certain texture of igneous rock regardless of its chemical and mineralogical composition. Its chief charact ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jampal (river)
The Yambina were an Aboriginal Australian people of the state of Queensland, whose traditional lands lie inland (westwards) some distance from Mackay. Country Yambina lands included Logan Creek south of Avon Downs. They ran east to the Denham Range and Logan Downs. The western extension lay around the area of Elgin Downs. They were also present at Solferino. Norman Tindale estimated their territory as circumscribing about . Social organisation The marriage rules governing the Yambina were set forth by Wilson and Murray, who discerned two classes, the ''Youngaroo'' and the ''Wootharoo''. History of contact Within a few decades of white settlement, it was estimated that the Yambina numbered 100. Language The language of the Yambina people was Yambina, considered a dialect of the Biri language. No speakers of the language have been recorded since before 1975. Alternative names AIATSIS' AUSTLANG The Australian Institute of Aboriginal and Torres Strait Islander Studies (AIA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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