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Nero Lake
Lake Nero () is a shallow, highly eutrophic lake in Yaroslavl Oblast, Russia. The lake has an area of 54.4 km², a maximum length of 13 km, width 8 km and depth 3.6 m. The bottom of the lake is covered with thick layer of silt sapropel (a sort of ooze used as fertilizer and for other purposes). The lake is estimated to be about 500 thousand years old, making it one of a few pre-ice age lakes in central Russia. The first people settled at the lake 6 thousand years ago. It is historically certain that the Merya people had their capital in Sarskoe Gorodishche on the southern shore of the lake. They named the lake ''Nero'' (meaning "silty", "marshland") or ''Kaovo'' ("place where gulls live"). In the 9th Century East Slavs came to the lake. They called the lake ''Rostovian Lake'' in the honor of town Rostov. There are two significant islands, ''Lvovsky'' (Львовский, " Island"), also known as ''Lesny'' (Лесный, "Forest Island"), and ''Rozhdestven ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yaroslavl Oblast
Yaroslavl Oblast (russian: Яросла́вская о́бласть, ''Yaroslavskaya oblast'') is a federal subject of Russia (an oblast), which is located in the Central Federal District, surrounded by Tver, Moscow, Ivanovo, Vladimir, Kostroma, and Vologda oblasts. This geographic location affords the oblast the advantages of proximity to Moscow and St. Petersburg. Additionally, the city of Yaroslavl, the administrative center of the oblast, is served by major highways, railroads, and waterways. The population of the oblast was 1,272,468 ( 2010 Census). Geography The climate of Yaroslavl Oblast is temperate continental, with long, cold, and snowy winters, and a short but quite warm summer. Average January temperature is about , while the average in July is . Formerly almost all territory was covered with thick conifer forest ( fir, pine). After much of this was harvested, now a large portion of territory has been replaced by second-growth birch-and-aspen forests and cro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eutrophic
Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phytoplankton productivity". Water bodies with very low nutrient levels are termed oligotrophic and those with moderate nutrient levels are termed mesotrophic. Advanced eutrophication may also be referred to as dystrophic and hypertrophic conditions. Eutrophication can affect freshwater or salt water systems. In freshwater ecosystems it is almost always caused by excess phosphorus. In coastal waters on the other hand, the main contributing nutrient is more likely to be nitrogen, or nitrogen and phosphorus together. This depends on the location and other factors. When occurring naturally, eutrophication is a very slow process in which nutrients, especially phosphorus compounds and organic matter, accumulate in water bodies. These nutrients derive f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rostov
Rostov ( rus, Росто́в, p=rɐˈstof) is a town in Yaroslavl Oblast, Russia, one of the oldest in the country and a tourist center of the Golden Ring. It is located on the shores of Lake Nero, northeast of Moscow. Population: While the official name of the town is Rostov, it is popularly known to Russians as Rostov Veliky ( rus, Ростов Великий, ''Rostov the Great'') to distinguish it from the much larger city of Rostov-on-Don. The name of the town railway station is Rostov Yaroslavsky, due to its location in Yaroslavl Oblast. History Rostov was preceded by Sarskoye Gorodishche, which some scholars interpret as the capital of the Finnic Merya tribe. Others believe it was an important Viking trade enclave and fortress guarding the Volga trade route. It is known from Norse sources as Raðstofa. Scythians also settled there. These different ethnicities, such as the Vikings, Scyths, Slavs and Finns, were likely the ancestors of many of today's people in that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russia
Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the world, with its internationally recognised territory covering , and encompassing one-eighth of Earth's inhabitable landmass. Russia extends across Time in Russia, eleven time zones and shares Borders of Russia, land boundaries with fourteen countries, more than List of countries and territories by land borders, any other country but China. It is the List of countries and dependencies by population, world's ninth-most populous country and List of European countries by population, Europe's most populous country, with a population of 146 million people. The country's capital and List of cities and towns in Russia by population, largest city is Moscow, the List of European cities by population within city limits, largest city entirely within E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silt
Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water. Silt usually has a floury feel when dry, and lacks plasticity when wet. Silt also can be felt by the tongue as granular when placed on the front teeth (even when mixed with clay particles). Silt is a common material, making up 45% of average modern mud. It is found in many river deltas and as wind-deposited accumulations, particularly in central Asia, north China, and North America. It is produced in both very hot climates (through such processes as collisions of quartz grains in dust storms) and very cold climates (through such processes as glacial grinding of quartz grains.) Loess is soil rich in silt which makes up some of the most fertile agricultural land on Earth. However, silt is very vulnerable to erosion, and it has poor mechanical properties, making construction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sapropel
Sapropel (a contraction of ancient Greek words ''sapros'' and ''pelos'', meaning putrefaction and mud (or clay), respectively) is a term used in marine geology to describe dark-coloured sediments that are rich in organic matter. Organic carbon concentrations in sapropels commonly exceed 2 wt.% in weight. The term sapropel events may also refer to cyclic oceanic anoxic event (OAE), in particular those affecting the Mediterranean Sea with a periodicity of about 21,000 years. Formation Sapropels have been recorded in the Mediterranean sediments since the closure of the Eastern Tethys Ocean 13.5 million years ago. The formation of sapropel events in the Mediterranean Sea occurs approximately every 21,000 years and last between 3,000 and 5,000 years. The first identification of these events occurred in the mid-20th century. Since then, their formulative conditions of have been investigated. The occurrence of sapropels has been related to the Earth's orbital parameters (Milankovitc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fertilizer
A fertilizer (American English) or fertiliser (British English; see spelling differences) is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from liming materials or other non-nutrient soil amendments. Many sources of fertilizer exist, both natural and industrially produced. For most modern agricultural practices, fertilization focuses on three main macro nutrients: nitrogen (N), phosphorus (P), and potassium (K) with occasional addition of supplements like rock flour for micronutrients. Farmers apply these fertilizers in a variety of ways: through dry or pelletized or liquid application processes, using large agricultural equipment or hand-tool methods. Historically fertilization came from natural or organic sources: compost, animal manure, human manure, harvested minerals, crop rotations and byproducts of human-nature industries (i.e. fish processing waste, or bloodmeal from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Age
An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and greenhouse periods, during which there are no glaciers on the planet. Earth is currently in the Quaternary glaciation. Individual pulses of cold climate within an ice age are termed ''glacial periods'' (or, alternatively, ''glacials, glaciations, glacial stages, stadials, stades'', or colloquially, ''ice ages''), and intermittent warm periods within an ice age are called '' interglacials'' or ''interstadials''. In glaciology, ''ice age'' implies the presence of extensive ice sheets in both northern and southern hemispheres. By this definition, Earth is currently in an interglacial period—the Holocene. The amount of anthropogenic greenhouse gases emitted into Earth's oceans and atmosphere is predicted to prevent the next glacial period for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Merya People
The Meryans, also ''Merya'' (Russian: меря) were an ancient Finnic people that lived in the Upper Volga region. The Primary Chronicle places them around the Nero and Pleshcheyevo lakes. They were assimilated to Russians around the 13th century. History Jordanes mentioned "Merens" as a nation paying tribute to the Gothic ruler Ermanarich. According to the Primary Chronicle, the Varangians also forced the Meryans to pay tribute. This event is dated to 859, although the chronology is not reliable. Oleg of Novgorod forced the Meryans to take part in his 882 campaigns against Smolensk and Kiev. They are also mentioned as the participants of Oleg's campaign against Constantinople in 907. Merya began to be assimilated by East Slavs when their territory became incorporated into Kievan Rus' in the 10th century. Their assimilation in the Upper Volga region seems to have been complete by the 13th century. The ''Life of Abraham of Galich'' claims that, when arriving to the Lake Gali ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sarskoe Gorodishche
Sarskoye Gorodishche or Sarsky fort (russian: Сарское городище, literally "Citadel on the Sara") was a medieval fortified settlement in present-day Yaroslavl Oblast, Russia. It was situated on the bank of the Sara River (Russia), Sara River, a short distance from Lake Nero, to the south of modern Rostov, of which it seems to have been the early medieval predecessor. Exploration The site first attracted the attention of Russian archaeologists in the mid-19th century due to its imposing dimensions, which have no parallels in the region. Excavations begun by Count Aleksey Uvarov in 1854 revealed a number of superb Varangian objects comparable to the sites in Scandinavia, notably a Carolingian Empire, Carolingian sword with the inscription "Lun fecit". Excavations have been undertaken intermittently since that period by many persons, including Nicholas Roerich in 1903. In his diary, Roerich complained that the site had been reduced drastically by road builders. Afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gull
Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century, most gulls were placed in the genus ''Larus'', but that arrangement is now considered polyphyletic, leading to the resurrection of several genera. An older name for gulls is mews, which is cognate with German ''Möwe'', Danish ''måge'', Swedish ''mås'', Dutch ''meeuw'', Norwegian ''måke''/''måse'' and French ''mouette'', and can still be found in certain regional dialects. Gulls are typically medium to large in size, usually grey or white, often with black markings on the head or wings. They typically have harsh wailing or squawking calls; stout, longish bills; and webbed feet. Most gulls are ground-nesting carnivores which take live food or scavenge opportunistically, particularly the ''Larus'' species. Live food often includes crustac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East Slavic Peoples
The East Slavs are the most populous subgroup of the Slavs. They speak the East Slavic languages, and formed the majority of the population of the medieval state Kievan Rus', which they claim as their cultural ancestor.John Channon & Robert Hudson, ''Penguin Historical Atlas of Russia'' (Penguin, 1995), p. 16. Today, the East Slavs consist of Belarusians, Russians, Rusyns, and Ukrainians. History Sources Researchers know relatively little about the Eastern Slavs prior to approximately 859 AD when the first events recorded in the '' Primary Chronicle'' occurred. The Eastern Slavs of these early times apparently lacked a written language. The few known facts come from archaeological digs, foreign travellers' accounts of the Rus' land, and linguistic comparative analyses of Slavic languages. Very few native Rus' documents dating before the 11th century (none before the 10th century) have survived. The earliest major manuscript with information on Rus' history, the '' Primary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
