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Maars Of France
A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption (an explosion which occurs when groundwater comes into contact with hot lava or magma). A maar characteristically fills with water to form a relatively shallow crater lake, which may also be called a maar.David S.G. Thomas and Andrew Goudie (eds.), ''The Dictionary of Physical Geography'' (Oxford: Blackwell, 2000), 301. . Maars range in size from across and from deep. Most maars fill with water to form natural lakes. Most maars have low rims composed of a mixture of loose fragments of volcanic rocks and rocks torn from the walls of the diatreme. Etymology The name ''maar'' comes from a Moselle Franconian dialect word used for the circular lakes of the Daun area of Germany. The word evolved from its first use in German in the modern geological sense in 1819 and is now used in English and in the geological sciences as the term for the explosion crater, even if water from rainfall might always ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maar USGS
A maar is a broad, low-Terrain, relief volcanic crater caused by a phreatomagmatic eruption (an explosion which occurs when groundwater comes into contact with hot lava or magma). A maar characteristically fills with water to form a relatively shallow Volcanic crater lake, crater lake, which may also be called a maar.David S.G. Thomas and Andrew Goudie (eds.), ''The Dictionary of Physical Geography'' (Oxford: Blackwell, 2000), 301. . Maars range in size from across and from deep. Most maars fill with water to form natural lakes. Most maars have low rims composed of a mixture of loose fragments of volcanic rocks and rocks torn from the walls of the diatreme. Etymology The name ''maar'' comes from a Moselle Franconian language, Moselle Franconian dialect word used for the circular lakes of the Daun (Germany), Daun area of Germany. The word evolved from its first use in German in the modern geological sense in 1819 and is now used in English and in the geological sciences as th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laacher See
Laacher See (), also known as Lake Laach or Laach Lake, is a volcanic Volcanic crater lake, caldera lake with a diameter of in Rhineland-Palatinate, Germany, about northwest of Koblenz, south of Bonn, and west of Andernach. It is in the Eifel mountain range, and is part of the East Eifel volcanic field within the larger Volcanic Eifel. The lake was formed by a Plinian eruption approximately 13,000 years Before Present, BP with a Volcanic Explosivity Index (VEI) of 6, on the same scale as the Mount Pinatubo#1991 eruption, Pinatubo eruption of 1991. The Volcanic gas, volcanic discharge observable as mofettas on the southeastern shore of the lake is a sign of Dormant volcano, dormant volcanism. Description The lake is oval in shape and surrounded by high banks. The lava was quarried for millstones from the Roman period until the introduction of iron rollers for grinding grain. The water level has considerable rises and falls as the lake has no natural outlet. On the western side ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seward Peninsula
The Seward Peninsula is a large peninsula on the western coast of the U.S. state of Alaska whose westernmost point is Cape Prince of Wales. The peninsula projects about into the Bering Sea between Norton Sound, the Bering Strait, the Chukchi Sea, and Kotzebue Sound, just below the Arctic Circle. The entire peninsula is about long and wide. Like Seward, Alaska, it was named after William H. Seward, the United States Secretary of State who fought for the U.S. purchase of Alaska. The Seward Peninsula is a remnant of the Bering land bridge, a roughly thousand-mile-wide swath of land connecting Siberia with mainland Alaska during the Pleistocene Ice Age. This land bridge aided in the migration of humans, as well as plant and animal species, from Asia to North America. Excavations at sites such as the Trail Creek Caves and Cape Espenberg in the Bering Land Bridge National Preserve as well as Cape Denbigh to the south have provided insight into the timeline of prehistorical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Espenberg
Cape Espenberg is a cape located on the Seward Peninsula in Alaska, on the Chukchi Sea coast. Cape Espenberg points northwards, 42 mi NW of Deering, Kotzebue-Kobuk Low. On its southeastern side there is the small Goodhope Bay, an inlet of the Kotzebue Sound. Named in 1816 by Lt. Otto von Kotzebue (1821, p. 236) for Dr. Karl Espenberg, a surgeon who accompanied Captain (later Admiral, IRN) Adam Johann von Krusenstern Adam Johann von Krusenstern (; 10 October 177012 August 1846) was a Russian admiral and explorer of Swedish and Baltic German descent, who led the first Russian circumnavigation of the Earth in 1803–1806. Life Krusenstern was born i ... on his voyage around the world in 1803–06. Cape Espenberg lies on the Arctic Circle at the terminus of a 30 km long mainland attached beach ridge plain at the northern limit of Seward Peninsula, in western Alaska. At the entry of the shallow Kotzebue Sound embayment, Cape Espenberg faces a potent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eichholzmaar
The Eichholzmaar is one of the smaller maars in the Volcanic Eifel and lies on the ''Landstraße'' between Steffeln and Duppach. It has a diameter of c. 120 metres. Its greatest depth is 3 metres. The circular shape of the bowl of the maar can still be easily seen. It lies exactly on a geological fault line, which runs from northwest to southeast. At the beginning of the 20th century the maar was drained in order to create meadows. From late summer 2007 to spring 2008 a renaturalisation was carried out and the lake restored with an area of c. 1,1 hectares. In only a few years the maar has become a refuge for rare water birds and reptiles. Two natural mineral springs in the immediate vicinity of the maar are accessible on foot. About 300 metres upstream in a westerly direction from the Eichholzmaar is the mineral spring known as the ''Steffelner Dress'' (). Around 270 metres downstream in an easterly direction from the Eichholzmaar is the mineral spring of ''Aueler Dress'' (). D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steffeln
Steffeln is an '' Ortsgemeinde'' – a municipality belonging to a ''Verbandsgemeinde'', a kind of collective municipality – in the Vulkaneifel district in Rhineland-Palatinate, Germany. It belongs to the ''Verbandsgemeinde'' of Gerolstein, whose seat is in the municipality of Gerolstein. Geography Location The municipality lies in the Vulkaneifel, a part of the Eifel known for its volcanic history, geographical and geological features, and even ongoing activity today, including gases that sometimes well up from the earth. Constituent communities Steffeln's ''Ortsteile'' are, besides the main centre, also called Steffeln, Auel and Lehnerath. Climate Yearly precipitation in Steffeln amounts to 946 mm, which is very high, falling into the highest fourth of the precipitation chart for all Germany. At 81% of the German Weather Service's weather stations, lower figures are recorded. The driest month is April. The most rainfall comes in December. In that month, precipi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eckfelder Maar
The Eckfelder Maar is a former volcanic lake, that was formed during the Middle Eocene around 44.3 million years ago and is thus the oldest known maar. It lies in the southwestern Eifel mountains near Manderscheid in Germany.''Das Eckfelder Maar'' at www.eckfelder-maar.de. Retrieved 22 Jul 2016. It is also an important site that contains numerous fossil remains of fauna and flora, some of them nearly complete state of preservation. It has been continuously scientifically researched since 1987. The large number of finds - to date 25,000 fossil specimens have been found - have enabled a very detailed reconstruction of the landscape. This |
Silted Up
Sedimentation is the deposition of sediments. It takes place when particles in suspension settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity, centrifugal acceleration, or electromagnetism. Settling is the falling of suspended particles through the liquid, whereas sedimentation is the final result of the settling process. In geology, sedimentation is the deposition of sediments which results in the formation of sedimentary rock. The term is broadly applied to the entire range of processes that result in the formation of sedimentary rock, from initial erosion through sediment transport and settling to the lithification of the sediments. However, the strict geological definition of sedimentation is the mechanical deposition of sediment particles from an initial suspension in air or water. Sedimentation may pertain to obje ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aggradation
Aggradation (or alluviation) is the term used in geology for the increase in land elevation, typically in a river system, due to the deposition of sediment. Aggradation occurs in areas in which the supply of sediment is greater than the amount of material that the system is able to transport. The mass balance between sediment being transported and sediment in the bed is described by the Exner equation. Typical aggradational environments include lowland alluvial rivers, river deltas, and alluvial fans. Aggradational environments are often undergoing slow subsidence which balances the increase in land surface elevation due to aggradation. After millions of years, an aggradational environment will become a sedimentary basin, which contains the deposited sediment, including paleochannels and ancient floodplains. Aggradation can be caused by changes in climate, land use, and geologic activity, such as volcanic eruption, earthquake An earthquakealso called a quake, tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total population of over 84 million in an area of , making it the most populous member state of the European Union. It borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The Capital of Germany, nation's capital and List of cities in Germany by population, most populous city is Berlin and its main financial centre is Frankfurt; the largest urban area is the Ruhr. Settlement in the territory of modern Germany began in the Lower Paleolithic, with various tribes inhabiting it from the Neolithic onward, chiefly the Celts. Various Germanic peoples, Germanic tribes have inhabited the northern parts of modern Germany since classical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eifel
The Eifel (; , ) is a low mountain range in western Germany, eastern Belgium and northern Luxembourg. It occupies parts of southwestern North Rhine-Westphalia, northwestern Rhineland-Palatinate and the southern area of the German-speaking Community of Belgium. The Eifel is part of the Rhenish Massif; within its northern portions lies the Eifel National Park. The Eifelian stage in geological history is named after the region because rocks of that period reach the surface in the Eifel at the Wetteldorf Richtschnitt outcrop. The inhabitants of the Eifel are known as Eiflers or Eifelers. Geography Location The Eifel lies between the cities of Aachen to the north, Trier to the south and Koblenz to the east. It descends in the northeast along a line from Aachen via Düren to Bonn into the Lower Rhine Bay. In the east and south it is bounded by the valleys of the Rhine and the Moselle. To the west it transitions in Belgium and Luxembourg into the geologically related Ardenn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precipitation
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls from clouds due to gravitational pull. The main forms of precipitation include drizzle, rain, rain and snow mixed ("sleet" in Commonwealth usage), snow, ice pellets, graupel and hail. Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor (reaching 100% relative humidity), so that the water condenses and "precipitates" or falls. Thus, fog and mist are not precipitation; their water vapor does not condense sufficiently to precipitate, so fog and mist do not fall. (Such a non-precipitating combination is a colloid.) Two processes, possibly acting together, can lead to air becoming saturated with water vapor: cooling the air or adding water vapor to the air. Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are calle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
