|
Glacial Lakes
A glacial lake is a body of water with origins from glacier activity. They are formed when a glacier erodes the land and then melts, filling the depression created by the glacier. Formation Near the end of the last glacial period, roughly 10,000 years ago, glaciers began to retreat. A retreating glacier often left behind large deposits of ice in hollows between drumlins or hills. As the ice age ended, these melted to create lakes. This is apparent in the Lake District in Northwestern England where post-glacial sediments are normally between 4 and 6 metres deep. These lakes are often surrounded by drumlins, along with other evidence of the glacier such as moraines, eskers and erosional features such as striations and chatter marks. These lakes are clearly visible in aerial photos of landforms in regions that were glaciated during the last ice age. The formation and characteristics of glacial lakes vary between location and can be classified into glacial erosion lake, ice-block ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rila 7 Lakes Circus Panorama Edit1
Rila ( bg, Рила, ) is the highest mountain range of Bulgaria, the Balkan Peninsula and Southeast Europe. It is situated in southwestern Bulgaria and forms part of the Rila–Rhodope Massif. The highest summit is Musala at an elevation of 2,925 m which makes Rila the sixth highest mountain range in Europe after the Caucasus, the Alps, Sierra Nevada, the Pyrenees and Mount Etna, and the highest one between the Alps and the Caucasus. It spans a territory of 2,629 km2 with an average elevation of 1487 m. The mountain is believed to have been named after the river of the same name, which comes from the Old Bulgarian verb "рыти" meaning "to grub". Rila has abundant water resources. Some of the Balkans' longest and deepest rivers originate from Rila, including the Maritsa, Iskar and Mesta rivers. Bulgaria's main water divide separating the Black Sea and the Aegean Sea drainage systems follows the main ridge of Rila. The mountain range is dotted with almost 200 gla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacial Lake Outburst Flood
A glacial lake outburst flood (GLOF) is a type of outburst flood caused by the failure of a dam containing a glacial lake. An event similar to a GLOF, where a body of water contained by a glacier melts or overflows the glacier, is called a jökulhlaup. The dam can consist of glacier ice or a terminal moraine. Failure can happen due to erosion, a buildup of water pressure, an avalanche of rock or heavy snow, an earthquake or cryoseism, volcanic eruptions under the ice, or massive displacement of water in a glacial lake when a large portion of an adjacent glacier collapses into it. Increasing glacial melting because of climate change, alongside other environmental effects of climate change (i.e permafrost melting) mean that regions with glaciers are likely to see increased flooding risks from GLOFs. This is especially true in the Himalayas where geologies are more active. Definition A glacial lake outburst flood is a type of outburst flood occurring when water dammed by a g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gazey
Gazey () is a peak in the Pirin mountain, Bulgaria situated on a small sideward ridge of the Polejansli Ridge. It is 2,761 m high, which makes it ninth in the mountain. Viewed from Polejan it looks small, rising slightly above the Upper Polejan lake but its western slopes are dizzy as they descent towards the valley of Damyanitsa. The peak looks majestic from the valley, it can be clearly seen even from the Razlog Valley. Below the larger peak tower a lower one which also looks imposing. The ridge of the same name forms a cirque in which the two Gazey lakes, some of the highest in the Balkans are located as well as the Gazey river. Gazey Nunatak in Antarctica is named after the peak. References {{Reflist Mountains of Pirin Landforms of Blagoevgrad Province Two-thousanders of Bulgaria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valyavishki Lakes
The Valyavishki Lakes () is a group of lakes in the northern part of the Pirin National Park in southwestern Bulgaria and includes 10 lakes. They are situated in the cirque of the same name. The lakes are glacial and lie on a granite bed. They are located between 2,300 and 2,475 m. Their shores are steep and rocky. The higher lakes drain into the lower ones due to their step-like situation. Pine-scrub grows around the lakes. Trout Trout are species of freshwater fish belonging to the genera '' Oncorhynchus'', '' Salmo'' and '' Salvelinus'', all of the subfamily Salmoninae of the family Salmonidae. The word ''trout'' is also used as part of the name of some non-salm ... are abundant in the waters. There have been attempts to introduce Brook trout into the lakes. The group is the source of the Valyavitsa river which is a main tributary to the Demyanitsa river. The largest lake by area is the ''Big Lake'' which is located at an altitude of 2379 m. It is 18 m deep. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perito Moreno Glacier
The Perito Moreno Glacier () is a glacier located in Los Glaciares National Park in southwest Santa Cruz Province, Argentina. It is one of the most important tourist attractions in the Argentine Patagonia. The ice formation, in length, is one of 48 glaciers fed by the Southern Patagonian Ice Field located in the Andes system shared with Chile. This ice field is the world's third largest reserve of fresh water. The Perito Moreno Glacier, located from El Calafate, was named after the explorer Francisco Moreno, a pioneer who studied the region in the 19th century and played a major role in defending the territory of Argentina in the conflict surrounding the international border dispute with Chile. Status Despite most of the innumerable glaciers worldwide retreating, one of the few unusual glaciers that maintains in a state of equilibrium is the Perito Moreno Glacier because it continues to accumulate mass at a rate similar to that of its loss. The reason remains debated by glac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Skua
The parasitic jaeger (''Stercorarius parasiticus''), also known as the Arctic skua, Arctic jaeger or parasitic skua, is a seabird in the skua family Stercorariidae. It is a migratory species that breeds in Northern Scandinavia, Scotland, Iceland, Greenland, Northern Canada, Alaska, and Siberia and winters across the southern hemisphere. Kleptoparasitism is a major source of food for this species during migration and winter, and is where the name is derived from. Etymology The word "jaeger" is derived from the German word ''Jäger'', meaning "hunter". The English "skua" comes from the Faroese name ''skúgvur'' for the great skua, with the island of Skúvoy known for its colony of that bird. The general Faroese term for skuas is ''kjógvi'' . The genus name ''Stercorarius'' is Latin and means "of dung"; the food disgorged by other birds when pursued by skuas was once thought to be excrement. The specific ''parasiticus'' is from Latin and means "parasitic". Description Ide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Tern
The Arctic tern (''Sterna paradisaea'') is a tern in the family Laridae. This bird has a circumpolar breeding distribution covering the Arctic and sub-Arctic regions of Europe (as far south as Brittany), Asia, and North America (as far south as Massachusetts). The species is strongly migratory, seeing two summers each year as it migrates along a convoluted route from its northern breeding grounds to the Antarctic coast for the southern summer and back again about six months later. Recent studies have shown average annual round-trip lengths of about for birds nesting in Iceland and Greenland and about for birds nesting in the Netherlands. These are by far the longest migrations known in the animal kingdom. The Arctic tern nests once every one to three years (depending on its mating cycle). Arctic terns are medium-sized birds. They have a length of and a wingspan of . They are mainly grey and white plumaged, with a red/orange beak and feet, white forehead, a black nape and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jökulsárlón
Jökulsárlón (; literally "glacial river lagoon") is a large glacial lake in southern part of Vatnajökull National Park, Iceland. Situated at the head of the Breiðamerkurjökull glacier, it developed into a lake after the glacier started receding from the edge of the Atlantic Ocean. The lake has grown since then at varying rates because of melting of the glaciers. It is now about away from the ocean's edge and covers an area of about . In 2009 it was reported to be the deepest lake in Iceland, at over , as glacial retreat extended its boundaries. The size of the lake has increased fourfold since the 1970s. The lake can be seen from Route 1 between Höfn and Skaftafell. It appears as "a ghostly procession of luminous blue icebergs". Jökulsárlón has been a setting for four Hollywood movies: ''A View to a Kill'', ''Die Another Day'', '' Lara Croft: Tomb Raider'', and ''Batman Begins'', as well as the reality TV series ''The Amazing Race''. In 1991, Iceland issued a postage st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Seal At The Glacial Lagoon
A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey a and single-storey ɑ. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English grammar, " a", and its variant " an", are indefinite articles. History The earliest certain ancestor of "A" is aleph (also written 'aleph), the first letter of the Phoenician alphabet, which consisted entirely of consonants (for that reason, it is also called an abjad to distinguish it fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Flour
Rock flour, or glacial flour, consists of fine-grained, silt-sized particles of rock, generated by mechanical grinding of bedrock by glacial erosion or by artificial grinding to a similar size. Because the material is very small, it becomes suspended in meltwater making the water appear cloudy, which is sometimes known as glacial milk. When the sediments enter a river, they turn the river's colour grey, light brown, iridescent blue-green, or milky white. If the river flows into a glacial lake, the lake may appear turquoise in colour as a result. When flows of the flour are extensive, a distinct layer of a different colour flows into the lake and begins to dissipate and settle as the flow extends from the increase in water flow from the glacier during snow melts and heavy rain periods. Examples of this phenomenon may be seen at Lake Pukaki and Lake Tekapo in New Zealand, Lake Louise, Moraine Lake, Emerald Lake, and Peyto Lake in Canada, Gjende lake in Norway, and several lakes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron
Boron is a chemical element with the symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the '' boron group'' it has three valence electrons for forming covalent bonds, resulting in many compounds such as boric acid, the mineral sodium borate, and the ultra-hard crystals of boron carbide and boron nitride. Boron is synthesized entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, so it is a low-abundance element in the Solar System and in the Earth's crust. It constitutes about 0.001 percent by weight of Earth's crust. It is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals. These are mined industrially as evaporites, such as borax and kernite. The largest known deposits are in Turkey, the largest producer of boron minerals. Elemental boron is a meta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
