EEG brain topography was invented by Walter Grey Walter, who, in 1936, proved that, by using a larger number of electrodes pasted to the scalp, each one having a small size, and a triangulation algorithm, it was possible to identify abnormal electrical activity in the brain areas around a tumor, and diminished activity inside it. Impressed with the possibilities of building bidimensional maps of the EEG activity over the brain surface, Grey Wal ...

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EEG topography, EEG topography - History, EEG topography - Medical applications, EEG topography - Source

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See also:

EEG topography, EEG topography - History, EEG topography - Medical applications, EEG topography - Source

Read more here: » EEG topography: Encyclopedia II - EEG topography - Medical applications

Karst landforms are generally the result of mildly acidic rainfall acting on soluble limestone or dolostone bedrock. The process of subsurface rock dissolution results in a topography with distinctive features, including sinkholes or dolines (closed basins), vertical shafts, disappearing streams, and springs. After sufficient time, complex underground drainage systems (such as karst aquifers) and extensive caves and cavern systems may form. The carbonic acid that causes these features is formed as rain passes through the atmosphere pi ...

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Karst topography, Karst topography - Chemistry of karst landscapes, Karst topography - Karst formations, Karst topography - Water drainage and problems, Karst topography - Pseudokarst, Karst topography - Partial list of karst areas

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The Wannagan Creek site is a fossil site found in the South Unit of Theodore Roosevelt National Park of North Dakota, USA. The site is Paleocene in age, approximately 60 million years old. Paleontologists of the Science Museum of Minnesota have studied the site for nearly thirty years. The site is thought to represent a paleoenviroment of subtropical swampy lowland and forests. Preservation is excellent for both the flora and fauna of the site. Trace fossils of cro ...

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Wannagan Creek site - Topography/Geology Wannagan Creek site - Fauna Wannagan Creek site - Flora

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The Canadian Arctic is a vast region of northern Canada. Technically, the term covers that portion of Canada north of the Arctic Circle. An alternate, more practical definition is that portion north of the tree line (a definition that includes Canada's geographical centre): covering most of Nunavut, and the northernmost parts of the Northwest Territories, Yukon, Quebec, Ontario, Manitoba, and Labrador. A political definition, referred to as The North or Northern Canada, consists of Canada's three territorie ...

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Canadian Arctic - Territoriality Canadian Arctic - Topography Canadian Arctic - Human geography Canadian Arctic - Related topics Canadian Arctic - External link

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The town of Burslem known as the Mother Town is one of those that make up the city of Stoke-on-Trent, in the county of Staffordshire, in the Midlands of England. Burslem - Topography of Burslem. Burslem is sited on the eastern ridge of the Fowlea Valley, the Fowlea being one of the main early tributaries of the River Trent. Burslem embraces the areas of Middleport, Dalehall, Longport, Westport, Trubshaw Cross, and Brownhills. The Trent & Mersey canal cuts through, to the wes ...

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Burslem - Topography of Burslem Burslem - History of Burslem Burslem - Burslem in old trade journals Burslem - Population & housing in Burslem Burslem - Economy in Burslem Burslem - Tourism in Burslem Burslem - Education in Burslem Burslem - The environment in Burslem Burslem - Transport Burslem - Legends

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Maui is the second-largest of the Hawaiian Islands at 727 square miles (1883 km²). Native Hawaiian tradition gives the origin of the island's name in the legend of Hawaiʻiloa, the Polynesian navigator attributed with discovery of the Hawaiian Islands. The story relates how he named the island of Maui after his son who in turn was named for the demi-god Maui. According to legend, the demi-god Maui raised all the Hawaiian Islands from the sea. The Island of Maui is also called the "Valley Isle" for the large ...

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Maui - History Maui - Modern development Maui - Economy Maui - Topography Maui - Climate Maui - Tourism Maui - Sources

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Erosion along limestone shores, common in the tropics, produces typical karst topography, including a sharp makatea surface above the normal reach of the sea and undercuts that are mostly the result of biological activity or bioerosion at or a little above mean sea level. Some of the most dramatic of these formations can be seen in Thailand's Phangnga Bay and Halong Bay in Vietnam. Calcium carbonate removed by water may deposit elsewhere. In caves, stalactites and stalagmites are formed by deposition of calcium carbonate and ot ...

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Karst topography, Karst topography - Chemistry of karst landscapes, Karst topography - Karst formations, Karst topography - Water drainage and problems, Karst topography - Pseudokarst, Karst topography - Partial list of karst areas

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Farming in karst areas must take into account the excessive drainage. The soils may be fertile enough, and rainfall may be adequate, but rainwater quickly moves through the crevices into the ground, sometimes leaving the surface soil parched between rains. Water supplies from wells in karst topography are inherently hazardous, as the well water may simply run from a sinkhole in a cattle pasture through a cave and to the well, ...

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Karst topography, Karst topography - Chemistry of karst landscapes, Karst topography - Karst formations, Karst topography - Water drainage and problems, Karst topography - Pseudokarst, Karst topography - Partial list of karst areas

Read more here: » Karst topography: Encyclopedia II - Karst topography - Water drainage and problems

For many centuries, Hunza has provided the quickest access to Swat and Gandhara for a person traveling on foot. The route was impassable to baggage animals; only human porters could get through, and then only with permission from the locals. Hunza was easily defended as the paths were often less than half a metre (about 18") wide. The high mountain paths often crossed bare cliff faces on logs wedged into cracks in the cliff, with stones balanced on top. They were also constantly exposed to regular damage from weather and falling rocks ...

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Hunza, Hunza - Location and topography, Hunza - Ethnicity, Hunza - Princely Hunza

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The river originates at Powai and meets the Arabian Sea at Mahim Creek flowing through residential and industrial complexes of Powai, Saki Naka, Kurla, Kalina, Vakola, Bandra-Kurla complex, Dharavi and Mahim over a distance of about 15 km. The river bed is narrow in the initial stretch and is about 10 meters wide but at Bandra-Kurla complex, it is much wider. ...

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Mithi River, Mithi River - Topography, Mithi River - Ecological importance of the river, Mithi River - Pollution of the Mithi River

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www.dimondsoft.com Most observers describe Venezuela in terms of four fairly well-defined regions: the Maracaibo lowlands in the northwest, the northern mountains extending in a broad east-west arc from the Colombian border along the Caribbean Sea, the wide Orinoco plains (llanos) in central Venezuela, and the highly dissected Guiana highlands in the southeast. The Maracaibo lowlands form a large spoon-shaped oval bounded by mountains on three sides and open to the Caribbean on the north. The area is remarkably flat with only a gentle ...

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Geography of Venezuela, Geography of Venezuela - Topography, Geography of Venezuela - Climate, Geography of Venezuela - Hydrography, Geography of Venezuela - Other facts, Geography of Venezuela - Sources

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Terrain: generally flat Elevation extremes: lowest point: South China Sea 0 m highest point: Coloane Alto 174 m Macau has generally flat terrain resulting from extensive land reclamation, but numerous steep hills mark the original natural land mass. The modern high-rise skyline of Macau obscures much of the hilly landscape. The Macau skyline both defines and obscures its topography. ...

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Geography of Macau, Geography of Macau - Location Size Border and Coastline, Geography of Macau - Topography, Geography of Macau - Climate, Geography of Macau - Natural Resources, Geography of Macau - Land Use, Geography of Macau - Environmental Factors

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The Hula Valley lies within the northern part of the Syrian-African Rift Valley at an elevation of about 70 metres above sea level. On both sides of the valley are steep slopes -- the Golan Heights to the east and the Upper Galilee mountains to the west, rise to 400 to 900 metres above sea level. Basaltic hills of about 200 metres above sea level along the southern side of the valley intercept the Jordan River, and are commonly referred to as the basalt "plug" (actually a temporary geologic base level), as they restrict water drainage downstream into the Sea of Galilee (Lake Kinneret). The Hula Valley covers an area of ...

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Lake Hula, Lake Hula - Topography, Lake Hula - Climate, Lake Hula - The name of the valley, Lake Hula - The history of the valley, Lake Hula - The drainage of the lake, Lake Hula - Lake Agmon

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Despite its small area, Georgia has one of the most varied topographies of the former Soviet republics. Georgia lies mostly in the Caucasus Mountains, and its northern boundary is partly defined by the Greater Caucasus range. The Lesser Caucasus range, which runs parallel to the Turkish and Armenian borders, and the Surami and Imereti ranges, which connect the Greater Caucasus and the Lesser Caucasus, create natural barriers that are partly responsible for cultural and linguistic differences among regions. Because of their elevation and a po ...

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Geography of Georgia, Geography of Georgia - Topography, Geography of Georgia - Climate, Geography of Georgia - Environmental issues, Geography of Georgia - Area and boundaries, Geography of Georgia - Resources and land use, Geography of Georgia - Sources

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While the largest part of the Arctic is composed of seemingly non-stop permanent ice and tundra north of the tree line, it encompasses geological regions of varying types: the Inuitian Region (with the British Empire Range and the United States Range on Ellesmere Island) contains the northernmost mountain system in the world and is geologically distinct from the Arctic Region (which consists largely of lowlands). The Arctic and Hudson Bay lowlands comprise a substantial part of the geographic region often considered part of the ...

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Canadian Arctic, Canadian Arctic - Territoriality, Canadian Arctic - Topography, Canadian Arctic - Human geography, Canadian Arctic - Related topics, Canadian Arctic - External link

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Most of the country has an elevation of fewer than 200 meters. Although Hungary has several moderately high ranges of mountains, those reaching heights of 300 meters or more cover less than 2 percent of the country. The highest point in the country is Mount Kekes (1,008 meters) in the Matra Mountains northeast of Budapest. The lowest spot is 77.6 meters above sea level, located in the Hortobagy. The major rivers in the country are the Danube and Tisza. About one-third of the total length of the Danube River lies in Hungary; the river ...

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Geography of Hungary, Geography of Hungary - Topography, Geography of Hungary - Climate, Geography of Hungary - Sources

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The main characteristic of Bulgaria's topography is alternating bands of high and low terrain that extend east to west across the country. From north to south, those bands are the Danubian Plateau, Stara Planina (the Balkan Mountains), the central Thracian Plain, and the Rhodope Mountains. The easternmost sections near the Black Sea are hilly, but they gradually gain height to the west until the west ...

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Geography of Bulgaria, Geography of Bulgaria - Boundaries, Geography of Bulgaria - Topography, Geography of Bulgaria - Drainage, Geography of Bulgaria - Climate, Geography of Bulgaria - Environment, Geography of Bulgaria - Political geography, Geography of Bulgaria - Area and boundaries, Geography of Bulgaria - Resources and land use, Geography of Bulgaria - Sources

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The country consists mainly of a plateau between 700 and 1,000 meters high, divided into ridges by valleys and gorges, and a few mountainous areas. Fractures of the earth's surface are evident in the great geological rift that extends southward from the Jordan Valley through the Gulf of Aqaba and the Red Sea, gradually disappearing south of the lake country of East Africa. Although an earthquake-prone region, as of early 1989 no seve ...

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Geography of Jordan, Geography of Jordan - Boundaries, Geography of Jordan - Topography, Geography of Jordan - Climate, Geography of Jordan - Area and boundaries, Geography of Jordan - Resources and land use, Geography of Jordan - Environmental concerns, Geography of Jordan - Sources

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The country is divided into four regions: the coastal plain, the central hills, the Jordan Rift Valley, and the Negev Desert. The Mediterranean coastal plain stretches from the Lebanese border in the north to Gaza in the south, interrupted only by Cape Carmel at Haifa Bay. It is about forty kilometers wide at Gaza and narrows toward the north to about five kilometers at the Lebanese border. The region is fertile and humid (historically malarial) and is known for its citrus and viniculture. The plain is traversed by several short streams, of which only two, ...

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Geography of Israel, Geography of Israel - Topography, Geography of Israel - Climate, Geography of Israel - Area and boundaries, Geography of Israel - Resources and land use, Geography of Israel - Environmental concerns, Geography of Israel - Extreme points, Geography of Israel - Other geographic features, Geography of Israel - Sources

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