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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] |
Overexploitation
Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Continued overexploitation can lead to the destruction of the resource, as it will be unable to replenish. The term applies to natural resources such as water aquifers, grazing pastures and forests, wild medicinal plants, fish stocks and other wildlife. In ecology, overexploitation describes one of the five main activities threatening global biodiversity. Ecologists use the term to describe populations that are harvested at an unsustainable rate, given their natural rates of mortality and capacities for reproduction. This can result in extinction at the population level and even extinction of whole species. In conservation biology, the term is usually used in the context of human economic activity that involves the taking of biological resources, or organisms, in larger numbers than their populations can withstand. The term is also used and defined some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seeburger See
Seeburger See is a lake in the karst region of the Lower Eichsfeld, Landkreis Göttingen, in southeastern Lower Saxony, Germany. Also known as ''Auge des Eichsfelds'' (Eye of the Eichsfeld), the shallow 86.5-hectare (0.865 km2) lake is fed in the west by the ''Aue'' creek at Seeburg and drained to the east in Bernshausen by the same creek and lies at an elevation of 157 m AMSL. The lake is postglacial, having formed about 500 B.C. when a cave collapsed. The lake is the largest natural body of water in Göttingen district. It is bordered in places by reedy growth and elsewhere by trees and grasslands. Other than the two villages, the surrounding land is mostly agricultural, though there is a recreational area with swimming facilities near Seeburg, and a large part of the lake's shoreline ("Naturschutzgebiet Seeburger See") and a small forested area to the north are protected nature zones. Controlled fishing is allowed in the lake, with eel being the most common (and prov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zwischenahner Meer
is a lake in Ammerland, Lower Saxony, Germany. It is at an elevation of approximately 5 meters, and has a surface area of 5.5 km2. The town of Bad Zwischenahn is located on the southern end of the lake, Rostrup on the western end, and Dreibergen on the northern end. It is the third largest lake in Lower Saxony. The lake is around 6 meters deep at its deepest point, and has an average depth of 3 meters. It emerged 11,000 years ago, after the collapse of a salt dome. The Zwischenahner Meer is navigable, and regular ferry services began in 1874. It has also been home to the so-called ''Weiße Flotte'' (White Fleet) since 1987. The three ships run on regularly scheduled routes between the different landing piers along the lakeside. The piers are located in Bad Zwischenahn, Rostrup, and Dreibergen. Sailing, boating, and other recreational water sports are also popular past times. The lake has made Bad Zwischenahn a very popular tourist destination, as the town hosts numerous spa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arendsee (lake)
The Lake Arend is a natural lake in the Altmark region, northern Saxony-Anhalt, Germany. It is 23.3 m above sea level, and its area is 5.14 km², its depth nearly 50 m. It is the largest and deepest natural lake in Saxony-Anhalt. The lake lies on top of a salt dome and developed by repeated caving-in events that continued into historical time; at the end of the 19th century it was believed to have been created by an earthquake in 815 AD.Brockhaus' Konversations-Lexikon. 14th ed., Leipzig, Berlin and Vienna 1894; Vol. 1, p. 845 Hydrologically, the lake is more or less isolated with only a small artificial outflow connecting with the Elbe river via the river Jeetzel. The water body (0.147 bill. m³) only changes every 100 years. The town Arendsee and the municipality Schrampe Schrampe is a village and a former municipality in the district Altmarkkreis Salzwedel, in Saxony-Anhalt, Germany. Since 1 January 2010, it is part of the town Arendsee Arendsee () is a town in the Altm ... [...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 much earlier ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morphogenetic
Morphogenesis (from the Greek ''morphê'' shape and ''genesis'' creation, literally "the generation of form") is the biological process that causes a cell, tissue or organism to develop its shape. It is one of three fundamental aspects of developmental biology along with the control of tissue growth and patterning of cellular differentiation. The process controls the organized spatial distribution of cells during the embryonic development of an organism. Morphogenesis can take place also in a mature organism, such as in the normal maintenance of tissue by stem cells or in regeneration of tissues after damage. Cancer is an example of highly abnormal and pathological tissue morphogenesis. Morphogenesis also describes the development of unicellular life forms that do not have an embryonic stage in their life cycle. Morphogenesis is essential for the evolution of new forms. Morphogenesis is a mechanical process involving forces that generate mechanical stress, strain, and mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinkholes
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] |
Rock Salt
Halite (), commonly known as rock salt, is a type of salt, the mineral (natural) form of sodium chloride ( Na Cl). Halite forms isometric crystals. The mineral is typically colorless or white, but may also be light blue, dark blue, purple, pink, red, orange, yellow or gray depending on inclusion of other materials, impurities, and structural or isotopic abnormalities in the crystals. It commonly occurs with other evaporite deposit minerals such as several of the sulfates, halides, and borates. The name ''halite'' is derived from the Ancient Greek word for "salt", ἅλς (''háls''). Occurrence Halite dominantly occurs within sedimentary rocks where it has formed from the evaporation of seawater or salty lake water. Vast beds of sedimentary evaporite minerals, including halite, can result from the drying up of enclosed lakes and restricted seas. Such salt beds may be hundreds of meters thick and underlie broad areas. Halite occurs at the surface today in playas in region ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tectonically
Tectonics (; ) are the processes that control the structure and properties of the Earth's crust and its evolution through time. These include the processes of mountain building, the growth and behavior of the strong, old cores of continents known as cratons, and the ways in which the relatively rigid plates that constitute the Earth's outer shell interact with each other. Tectonics also provide a framework for understanding the earthquake and volcanic belts that directly affect much of the global population. Tectonic studies are important as guides for economic geologists searching for fossil fuels and ore deposits of metallic and nonmetallic resources. An understanding of tectonic principles is essential to geomorphologists to explain erosion patterns and other Earth surface features. Main types of tectonic regime Extensional tectonics Extensional tectonics is associated with the stretching and thinning of the crust or the lithosphere. This type of tectonics is found ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permian
The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleozoic Era; the following Triassic Period belongs to the Mesozoic Era. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the region of Perm in Russia. The Permian witnessed the diversification of the two groups of amniotes, the synapsids and the sauropsids ( reptiles). The world at the time was dominated by the supercontinent Pangaea, which had formed due to the collision of Euramerica and Gondwana during the Carboniferous. Pangaea was surrounded by the superocean Panthalassa. The Carboniferous rainforest collapse left behind vast regions of desert within the continental interior. Amniotes, which could better cope with these drier conditions, rose to dominance in place of their am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salt Domes
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] |
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