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Polar Desert
Ice deserts are the regions of Earth that fall under an ice cap climate upright=1.4, Effect of Sun angle on climate, Solar radiation has a lower intensity in polar regions because it travels a longer distance through the atmosphere, and is also spread across a larger surface area due to its oblique angle of approach. A ... (''EF'' under the Köppen classification). Despite rainfall totals low enough to normally classify as a desert A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of ..., polar deserts are distinguished from true deserts (' or ' under the Köppen classification) by low annual temperatures and evapotranspiration Evapotranspiration (ET) is the sum of water evaporation and transpiration from a surface area to the Atmosphere of Earth, atmosphere. Evaporation accounts for ...
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Cyanobacteria
Cyanobacteria (), also known as Cyanophyta, are a phylum In biology, a phylum (; plural The plural (sometimes list of glossing abbreviations, abbreviated ), in many languages, is one of the values of the grammatical number, grammatical category of number. The plural of a noun typically denotes a q ... of Gram-negative bacteria Gram-negative bacteria are bacteria Bacteria (; common noun bacteria, singular bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), do ... that obtain energy via photosynthesis Photosynthesis is a process used by plants and other organisms to convert Conversion or convert may refer to: Arts, entertainment, and media * Conversion (Doctor Who audio), "Conversion" (''Doctor Who'' audio), an episode of the audio drama ' .... The name ''cyanobacteria'' refers to their color (), giving them their other name, "blue-green algae", though ...
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Landforms
A landform is a natural or artificial feature of the solid surface of the Earth or other planetary body A planet is an astronomical body orbiting a star or Stellar evolution#Stellar remnants, stellar remnant that is massive enough to be Hydrostatic equilibrium, rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and .... Landforms together make up a given terrain Relief map of Sierra Nevada, Spain Terrain or relief (also topographical Topography is the study of the forms and features of land surfaces. The topography of an area could refer to the surface forms and features themselves, or a desc ..., and their arrangement in the landscape is known as topography Topography is the study of the forms and features of land surface Relief map of Sierra Nevada, Spain Terrain or relief (also topographical Topography is the study of the forms and features of land surfaces. The topography of an .... Landforms include hil ...
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Tundra
In physical geography Physical geography (also known as physiography) is one of the two fields of geography Geography (from Greek Greek may refer to: Greece Anything of, from, or related to Greece Greece ( el, Ελλάδα, , ), officially the Hell ..., tundra () is a type of biome A biome is a collection of flora, plants and fauna, animals that have common characteristics for the natural environment, environment they exist in. They can be found over a range of continents. Biomes are distinct biological community (ecology ... where the tree growth is hindered by low temperatures and short growing seasons. The term ''tundra'' comes through Russian Russian refers to anything related to Russia, including: *Russians (русские, ''russkiye''), an ethnic group of the East Slavic peoples, primarily living in Russia and neighboring countries *Rossiyane (россияне), Russian language term ... (') from the Kildin Sámi word (') meaning "uplands", " ...
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List Of Deserts
This is a list of deserts sorted by the region of the world in which the desert A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of ... is located. Afro-Eurasia Afro-Eurasia (or Afroeurasia, Field, Henry.The University of California African Expedition: I, Egypt, ''American Anthropologist,'' New Series Vol. 50, No. 3, Part 1 (Jul. - Sep., 1948), pp. 479-493. or Eurafrasia), nicknamed the World Island, ... Africa Africa is the world's second-largest and second-most populous continent A continent is any of several large landmass A landmass, or land mass, is a large region In geography Geography (from Greek: , ''geographia'', ... * Kalahari Desert The Kalahari Desert is a large semi-arid sandy savannah A savanna or savannah is a mix ...
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List Of Deserts By Area
This is a list of the largest desert, deserts in the world by area. It includes all deserts above . Notes See also * Desert * Desertification * List of deserts, List of deserts by continent * Polar desert * Tundra * United Nations Convention to Combat Desertification References {{DEFAULTSORT:List Of Deserts By Area Lists of landforms, Deserts By Area Deserts, * Geology-related lists, Deserts by area Deserts and xeric shrublands, * Lists by area, Deserts Lists of deserts, ...
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Desertification
Desertification is a type of land degradation Land degradation is a process in which the value of the biophysical environment is affected by a combination of human-induced processes acting upon the land. It is viewed as any change or disturbance to the land perceived to be deleterious or u ... in drylands Drylands are defined by a scarcity of water. Drylands are zones where precipitation In meteorology Meteorology is a branch of the atmospheric sciences Atmospheric science is the study of the Earth's atmosphere File:Atmosphere gas ... in which biological productivity is lost due to natural processes or induced by human activities whereby fertile areas become increasingly arid. It is the spread of arid areas caused by a variety of factors, such as climate change Contemporary climate change includes both the global warming caused by humans, and its impacts on Earth's weather patterns. There have been previous periods of climate change, but t ...
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Desert
A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation. About one-third of the land surface of the Earth is arid or semi-arid. This includes much of the Polar regions of Earth, polar regions, where little precipitation occurs, and which are sometimes called polar deserts or "cold deserts". Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location. Deserts are formed by weathering processes as large variations in temperature between day and night put strains on the rocks, which consequently break in pieces. Although rain seldom occurs in deserts, there are occasional downpours that can result in flash floods. Rain falling on hot rocks can cause them to shatter, and the resu ...
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Global Warming
Contemporary climate change includes both the global warming caused by humans, and its impacts on Earth's weather patterns. There have been previous periods of climate change, but the current changes are more rapid than any known events in Earth's history. The main cause is the emission of greenhouse gases Greenhouse gas emissions are emissions of greenhouse gases created from a range of human activities that cause climate change Climate change includes both global warming driven by human emissions of greenhouse gases and the resulting ..., mostly carbon dioxide Carbon dioxide (chemical formula A chemical formula is a way of presenting information about the chemical proportions of s that constitute a particular or molecule, using symbols, numbers, and sometimes also other symbols, such as pare ... () and methane Methane (, ) is a chemical compound with the chemical formula (one carbon atom bonded to four hydrogen atoms). It is a gro ...
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Ice Age
An ice age is a long period of reduction in the temperature of Earth Earth is the third planet from the Sun and the only astronomical object known to harbour and support life. 29.2% of Earth's surface is land consisting of continents and islands. The remaining 70.8% is Water distribution on Earth, covered wit ...'s surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheet In , an ice sheet, also known as a continental glacier, is a mass of that covers surrounding terrain and is greater than . The only current ice sheets are in and ; during the at (LGM) the covered much of , the ice sheet covered and the c ...s and alpine glacier A glacier (; ) is a persistent body of dense that is constantly moving under its own weight. A glacier forms where the accumulation of exceeds its over many years, often . Glaciers slowly deform and flow under stresses induced by their wei ...s. Earth's climate alternates between ice ag ...
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Hypersaline Lake
A hypersaline lake is a landlocked body of water A body of water or waterbody (often spelled water body) is any significant accumulation of water, generally on a planet's surface. The term most often refers to oceans, seas, and lakes, but it includes smaller pools of water such as ponds, wetla ... that contains significant concentration In chemistry Chemistry is the scientific Science () is a systematic enterprise that builds and organizes knowledge Knowledge is a familiarity or awareness, of someone or something, such as facts A fact is an occurrence in t ...s of sodium chloride Sodium chloride , commonly known as salt (although sea salt also contains other chemical salt (chemistry), salts), is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With Molar mass, molar ... or other salts In chemistry Chemistry is the study of the properties and behavior of . It is a that covers the ...
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