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Maujahn Moor
The Maujahn or Maujahn Moor (also known colloquially in German as the ''Maujahnskuhle'') is a kettle bog in North Germany which began as a sinkhole. It is located a good two kilometres west of the town of Dannenberg between the villages of Thunpadel and Schmarsau in northeastern Lower Saxony. Location The bog is located on the eastern border of the D28 Lüneburg Heath natural region, within the Lower Drawehn, the transition to the D29 Wendland and Altmark natural region. Culturally, the Drawehn is usually associated with the Wendland. The Maujahn Moor is protected from the Atlantic macroclimate of Lower Saxony by the presence of the eastern slopes of the East Hanoverian end moraines (also known as the Göhrde-Drawehn Hills) formed during the Saalian glaciation and the climate is therefore clearly sub-continental. The surface of the moor lies 25 metres above sea level; the geest hillocks surrounding it reach heights of just above 50 metres. The most exposed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe and Asia from the "New World" of the Americas in the European perception of the World. The Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Europe and Africa to the east, and North and South America to the west. As one component of the interconnected World Ocean, it is connected in the north to the Arctic Ocean, to the Pacific Ocean in the southwest, the Indian Ocean in the southeast, and the Southern Ocean in the south (other definitions describe the Atlantic as extending southward to Antarctica). The Atlantic Ocean is divided in two parts, by the Equatorial Counter Current, with the North(ern) Atlantic Ocean and the South(ern) Atlantic Ocean split at about 8°N. Scientific explorations of the Atlanti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raised Bog
Raised bogs, also called ombrotrophic bogs, are acidic, wet habitats that are poor in mineral salts and are home to flora and fauna that can cope with such extreme conditions. Raised bogs, unlike fens, are exclusively fed by precipitation ( ombrotrophy) and from mineral salts introduced from the air. They thus represent a special type of bog, hydrologically, ecologically and in terms of their development history, in which the growth of peat mosses over centuries or millennia plays a decisive role. They also differ in character from blanket bogs which are much thinner and occur in wetter, cloudier climatic zones. Raised bogs are very threatened by peat cutting and pollution by mineral salts from the surrounding land (due to agriculture and industry). The last great raised bog regions are found in western Siberia and Canada. Terminology The term raised bog derives from the fact that this type of bog rises in height over time as a result of peat formation. They are like sponges o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesotrophic Lake
The Trophic State Index (TSI) is a classification system designed to rate water bodies based on the amount of biological productivity they sustain. Although the term "trophic index" is commonly applied to lakes, any surface water body may be indexed. The TSI of a water body is rated on a scale from zero to one hundred. Under the TSI scale, water bodies may be defined as: * oligotrophic (TSI 0–40, having the least amount of biological productivity, "good" water quality); * mesotrophic (TSI 40–60, having a moderate level of biological productivity, "fair" water quality); or * eutrophic to hypereutrophic (TSI 60–100, having the highest amount of biological productivity, "poor" water quality). The quantities of nitrogen, phosphorus, and other biologically useful nutrients are the primary determinants of a water body's TSI. Nutrients such as nitrogen and phosphorus tend to be limiting resources in standing water bodies, so increased concentrations tend to result in increased p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pine
A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts 187 species names of pines as current, together with more synonyms. The American Conifer Society (ACS) and the Royal Horticultural Society accept 121 species. Pines are commonly found in the Northern Hemisphere. ''Pine'' may also refer to the lumber derived from pine trees; it is one of the more extensively used types of lumber. The pine family is the largest conifer family and there are currently 818 named cultivars (or trinomials) recognized by the ACS. Description Pine trees are evergreen, coniferous resinous trees (or, rarely, shrubs) growing tall, with the majority of species reaching tall. The smallest are Siberian dwarf pine and Potosi pinyon, and the tallest is an tall ponderosa pine located in southern Oregon's Rogue Riv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinkhole
A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as ''vrtače'' and shakeholes, and to openings where surface water enters into underground passages known as ''ponor'', swallow hole or swallet. A ''cenote'' is a type of sinkhole that exposes groundwater underneath. A ''sink'' or ''stream sink'' are more general terms for sites that drain surface water, possibly by infiltration into sediment or crumbled rock. Most sinkholes are caused by karst processes – the chemical dissolution of carbonate rocks, collapse or suffosion processes. Sinkholes are usually circular and vary in size from tens to hundreds of meters both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide. Formation Natural processes Sinkholes may capture surf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carr (topography)
A carr is a type of waterlogged wooded terrain that, typically, represents a succession stage between the original reedy marsh and the likely eventual formation of forest in a sub-maritime climate.Whittow, John (1984). ''Dictionary of Physical Geography''. London: Penguin, 1984. . Carrs are wetlands that are dominated by shrubs rather than trees. The carr is one stage in a hydrosere: the progression of vegetation beginning from a terrain submerged by fresh water along a river or lake margin. In sub-maritime regions, it begins with reed-marsh. As the reeds decay, the soil surface eventually rises above the water, creating fens that allow vegetation such as sedge to grow. As this progression continues, riparian trees and bushes appear and a carr landscape is created – in effect a wooded fen in a waterlogged terrain. At this stage, overall, unlike the overwhelming acidity of decaying reeds, the pH is not too acidic and the soil is not too deficient in minerals, making a habitat f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratigraphic
Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithostratigraphy (lithologic stratigraphy), biostratigraphy (biologic stratigraphy), and chronostratigraphy (stratigraphy by age). Historical development Catholic priest Nicholas Steno established the theoretical basis for stratigraphy when he introduced the law of superposition, the principle of original horizontality and the principle of lateral continuity in a 1669 work on the fossilization of organic remains in layers of sediment. The first practical large-scale application of stratigraphy was by William Smith in the 1790s and early 19th century. Known as the "Father of English geology", Smith recognized the significance of strata or rock layering and the importance of fossil markers for correlating strata; he created the first geologic map o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bullenkuhle (Moor)
The Bullenkuhle is a predominantly marshy lake in the extreme north of the district of Gifhorn in the north German state of Lower Saxony. This strange biotope and geotope has been formed into a natural hollow in the terrain that is termed a sinkhole. The area is environmentally protected. Location The ''Bullenkuhle'' lies about 15 kilometres south of the town of Uelzen and a good kilometre west of the village of Bokel (in the municipality of Sprakensehl) at the edge of a large pine forest at a height of about above NN. A stream emerges in the immediate vicinity which is initially called the ''Bokeler Bach'' and, later, becomes the ''Aue'' and finally, after combining with other streams, becomes an Elbe tributary, the River Ilmenau. The area belongs to the southeast fringes of the ''Hohen Heide'' in the centre of the Lüneburg Heath. This landscape formed from end and ground moraines and periglacial sediments was created geomorphologically mainly by the edges of the ice sheet dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salt Dome
A salt dome is a type of structural dome formed when salt (or other evaporite minerals) intrudes into overlying rocks in a process known as diapirism. Salt domes can have unique surface and subsurface structures, and they can be discovered using techniques such as seismic reflection. They are important in petroleum geology as they can function as petroleum traps. Formation Stratigraphically, salt basins developed periodically from the Proterozoic to the Neogene. The formation of a salt dome begins with the deposition of salt in a restricted basin. In these basins, the outflow of water exceeds inflow. More concretely, the basin loses water through evaporation, resulting in the precipitation and deposition of salt. While the rate of sedimentation of salt is significantly larger than the rate of sedimentation of clastics, it is recognized that a single evaporation event is rarely enough to produce the vast quantities of salt needed to form a layer thick enough for the formation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hoher Mechtin
At a height of (466 feet) the Hoher Mechtin is the highest elevation in the Wendland in the district of Lüchow-Dannenberg in northern Germany, and is at the same time a significant high point on the entire North German Plain. It lies roughly at the centre point of the Drawehn ridge, which is also described as the East Hanoverian gravel or end moraine. (''Osthannoversche Kies-'' or ''Endmoräne''). The area is part of the ''Ostheide'' division of the Lüneburg Heath. Debris consisting of sand, loam, gravel, stones and glacial erratics several metres across was transported southwards by the glacier flowing from Scandinavia in a series of advances in the Saale glaciation, leaving the Drawehn behind as an end moraine after it melted. Today the area is predominantly covered in pine forest, but mixed deciduous forest comprising oak, birch, beech and other trees dominates the scene in a few places, especially on the high spots and slopes. On the summit of the Hoher Mechtin is a woode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geest (topography)
Geest is a type of landform, slightly raised above the surrounding countryside, that occurs on the plains of Northern Germany, the Northern Netherlands and Denmark. It is a landscape of sandy and gravelly soils formed as a glacial outwash plain and now usually mantled by a heathland vegetation on the glacial deposits left behind after the last ice age during the Pleistocene epoch.Whittow, John (1984). ''Dictionary of Physical Geography''. London: Penguin, p. 214. . The term ''geest'' is a substantivisation of the Low German adjective ''güst'', which means "dry and infertile". It is an Old Drift landscape, characterised by the sandy depositions of the Ice Age. In the depressions between the raised flats are wet meadows and, where drainage is poor, bogs. Geest lands are made up of moraines and sandurs. They are almost always next to flat marshlands, the geest being higher and better protected against flood but, compared to the marsh, with poor soil for agriculture. Where the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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