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Krustkalni Nature Reserve
Krustkalni Nature Reserve () is a nature reserve located in eastern Latvia that was founded in 1977.Reserves of the USSR: in 11 volumes. ed. V. E. Sokolova, E. E. Syroechkovskogo. M .: Mysl, 1989. T. Zapovedniki Pribaltiki i Belorussii. S. 170—173. It has an area of 2,978 hectares. Since 2004, this institution has been part of Natura 2000, a European Union network of protected areas. The reserve is managed by the Latgale regional administration. The nature reserve was created to preserve the characteristic biodiversity of the complex of water and forest ecosystems, a complex of coniferous forests and meadows, as well as underground springs that form small swamps and lakes. A feature of these springs is high calcium content, due to which limestone soils are formed. They encourage the growth of Calcicole, calciphile plants, which often occur in the coastal areas of the country, but are not typical of eastern Latvia. The reserve has 32 species of plants and 37 species of animals l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Latvia
Latvia ( or ; lv, Latvija ; ltg, Latveja; liv, Leţmō), officially the Republic of Latvia ( lv, Latvijas Republika, links=no, ltg, Latvejas Republika, links=no, liv, Leţmō Vabāmō, links=no), is a country in the Baltic region of Northern Europe. It is one of the Baltic states; and is bordered by Estonia to the north, Lithuania to the south, Russia to the east, Belarus to the southeast, and shares a maritime border with Sweden to the west. Latvia covers an area of , with a population of 1.9 million. The country has a temperate seasonal climate. Its capital and largest city is Riga. Latvians belong to the ethno-linguistic group of the Balts; and speak Latvian, one of the only two surviving Baltic languages. Russians are the most prominent minority in the country, at almost a quarter of the population. After centuries of Teutonic, Swedish, Polish-Lithuanian and Russian rule, which was mainly executed by the local Baltic German aristocracy, the independent R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Runoff
Surface runoff (also known as overland flow) is the flow of water occurring on the ground surface when excess rainwater, stormwater, meltwater, or other sources, can no longer sufficiently rapidly infiltrate in the soil. This can occur when the soil is saturated by water to its full capacity, and the rain arrives more quickly than the soil can absorb it. Surface runoff often occurs because impervious areas (such as roofs and pavement) do not allow water to soak into the ground. Furthermore, runoff can occur either through natural or man-made processes. Surface runoff is a major component of the water cycle. It is the primary agent of soil erosion by water. The land area producing runoff that drains to a common point is called a drainage basin. Runoff that occurs on the ground surface before reaching a channel can be a nonpoint source of pollution, as it can carry man-made contaminants or natural forms of pollution (such as rotting leaves). Man-made contaminants in runoff i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, . ''Magnesian limestone'' is an obsolete and poorly-defined term used variously for dolomite, for limes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lime (material)
Lime is a calcium-containing inorganic material composed primarily of oxides and hydroxide, usually calcium oxide and/or calcium hydroxide. It is also the name for calcium oxide which occurs as a product of coal-seam fires and in altered limestone xenoliths in volcanic ejecta. The International Mineralogical Association recognizes lime as a mineral with the chemical formula of CaO. The word ''lime'' originates with its earliest use as building mortar and has the sense of ''sticking or adhering''. These materials are still used in large quantities as building and engineering materials (including limestone products, cement, concrete, and mortar), as chemical feedstocks, and for sugar refining, among other uses. Lime industries and the use of many of the resulting products date from prehistoric times in both the Old World and the New World. Lime is used extensively for wastewater treatment with ferrous sulfate. The rocks and minerals from which these materials are derived, typ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbonates
A carbonate is a salt of carbonic acid (H2CO3), characterized by the presence of the carbonate ion, a polyatomic ion with the formula . The word ''carbonate'' may also refer to a carbonate ester, an organic compound containing the carbonate group C(=O)(O–)2. The term is also used as a verb, to describe carbonation: the process of raising the concentrations of carbonate and bicarbonate ions in water to produce carbonated water and other carbonated beverageseither by the addition of carbon dioxide gas under pressure or by dissolving carbonate or bicarbonate salts into the water. In geology and mineralogy, the term "carbonate" can refer both to carbonate minerals and carbonate rock (which is made of chiefly carbonate minerals), and both are dominated by the carbonate ion, . Carbonate minerals are extremely varied and ubiquitous in chemically precipitated sedimentary rock. The most common are calcite or calcium carbonate, CaCO3, the chief constituent of limestone (as well as t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocene
The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene has been identified with the current warm period, known as MIS 1. It is considered by some to be an interglacial period within the Pleistocene Epoch, called the Flandrian interglacial.Oxford University Press – Why Geography Matters: More Than Ever (book) – "Holocene Humanity" section https://books.google.com/books?id=7P0_sWIcBNsC The Holocene corresponds with the rapid proliferation, growth and impacts of the human species worldwide, including all of its written history, technological revolutions, development of major civilizations, and overall significant transition towards urban living in the present. The human impact on modern-era Earth and its ecosystems may be considered of global si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ravine
A ravine is a landform that is narrower than a canyon and is often the product of streambank erosion.Definition of "ravine" at Ravines are typically classified as larger in scale than , although smaller than s. Ravines may also be called a cleuch, dell, ghout (), [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vidzeme Upland
The Vidzeme Upland or the Vidzeme Highland ( lv, Vidzemes augstiene) is a hilly area of higher elevation in northeastern Latvia, named after the historical region of Vidzeme. Sometimes it is referred to as the Central Vidzeme Upland, to distinguish it from another hilly area of Vidzeme, Alūksne Upland, also known as the "East Vidzeme Upland". Geography The Vidzeme Upland is part of the drainage divide between Gauja and Daugava river basins. The upland contains the highest point of Latvia, the Gaiziņkalns hill. The plateau is based on a high elevation of bedrock, which is covered by the thickest Quaternary sediment cover in Latvia - on average 80 m, but in some places even up to 120-170 m thick. Therefore, the bedrock is exposed only in some places at the foot of the plateau. The average height of Vidzeme highlands is 250 m. There are several high peaks in the plateau: * Gaizinkalns (311.5 m) - the highest peak in Latvia and the second highest Baltic States, * (296.8 m) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ļaudona
Ļaudona (german: Laudohn) is a village in Ļaudona Parish, Madona Municipality in the Vidzeme region of Latvia. The Ļaudona Parish of the former Madona District was merged into the Administrative divisions of Latvia, municipality (''novads'') of Madona municipality, Madona in 2009. History of Ļaudona The historical Latgalians, Latgalian stronghold on the Aiviekste River was rebuilt as a fortress by the Archbishopric of Riga, Archbishop of Riga in 1274 and used for trade and military purpose. The Laudohn noble family, then vassals of Archbishop Henning Scharpenberg, acquired the manor of Toce (''Tootzen'') in 1432. The archbishop's castle had been destroyed in the 16th century Livonian War. With Livonia, Ļaudona was conquered by King Gustavus Adolphus of Sweden by the 1629 Truce of Altmark, and upon the 1721 Treaty of Nystad belonged to the Russian Empire. The famous Habsburg Monarchy, Austrian Field Marshal Ernst Gideon von Laudon was born here in 1717. Villages in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aiviekste
Aiviekste is a river in Latvia.Latvian Soviet Encyclopedia, p. 1-99. It begins at Lake Lubāns (the largest lake in Latvia) and drains into the Daugava (the largest river in Latvia). Aiviekste is the largest tributary of Daugava in Latvia. Aiviekste, along with the Pededze, forms the unofficial border between two historical Latvian regions Vidzeme and Latgale, although the administrative border was slightly different. The river is 114 kilometers long, with annual drainage 1.81 km³. Aiviekste is about 10-12 thousand years old, formed at the end of the last ice age and nearly after the ice age. Nearly a quarter of the river's flow is unregulated, but most of the river has been excavated, including with explosions. Aiviekste flows from the northern end of Lake Lubāns, where it does a wide semicircle and then turns southwest. At this stage is the smallest drop, in addition, here Aiviekste receives the largest tributaries Pededze, Bolupe and Iča. Furthermore, it was straightene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jēkabpils
Jēkabpils (; german: Jakobstadt; pl, Jakubów) is a state city in Jēkabpils Municipality in southeastern Latvia roughly halfway between Riga and Daugavpils and spanning the Daugava River. Historic Jēkabpils lies on the left bank, in Selonia while historic Krustpils (german: Kreutzburg, links=no) lies on the right bank, in Latgale. The two cities were united during Soviet rule in 1962 under the Jēkabpils name, but retain their distinct regional character. Jēkabpils was also formerly home to former Soviet Jēkabpils Air Base. History A stone cross-castle – Cruczeborch (german: Kreutzburg) – was built in 1237 by the bishop of Rīga. Archeological excavations on the nearby Asote mound indicate that this place was a busy trading centre for the Latgalians, one of the Latvian tribes, and had been inhabited since 1000 BC. An adjoining settlement already existed when Krustpils Castle was first built; it grew up around the castle as the village of Krustpils. The village ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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