|
Deserts Of Australia
Deserts cover about , or 18%, of the Australian mainland, but about 35% of the Australian continent receives so little rain, it is practically desert. Collectively known as the Great Australian desert, they are primarily distributed throughout the Western Plateau and interior lowlands of the country, covering areas from South West Queensland, the Far West region of New South Wales, Sunraysia in Victoria and Spencer Gulf in South Australia to the Barkly Tableland in Northern Territory and the Kimberley region in Western Australia. By international standards, the Great Australian desert receives relatively high rates of rainfall, around on average, but due to the high evapotranspiration it would be correspondingly arid. No Australian weather stations situated in an arid region record less than of average annual rainfall. The deserts in the interior and south lack any significant summer rains. The desert in western Australia is well explained by the little evaporation of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Deserts By Area
This is a list of the largest deserts in the world by area. It includes all deserts above . See also * Desert * Desertification * List of deserts, List of deserts by continent * Polar desert * Tundra * United Nations Convention to Combat Desertification Notes References [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barkly Tableland
The Barkly Tableland is a region in the Central East of the Northern Territory, extending into Western Queensland. The region was named after Sir Henry Barkly. The epithet "Tableland" is inaccurate, since the region is neither elevated relative to adjacent landforms, nor are the boundaries marked by a distinct change in elevation. The Barkly Tableland is a poorly defined region. The name Barkly Tableland properly applies only to the areas of largely treeless, cracking-clay soils supporting grasslands dominated by Mitchell Grass (Astrebla spp.). A variety of terms such as "Barkly Tablelands Region", or "Barkly Region" have come into common use, referring to various circumscriptions of the region. All include portions of the Barkly Tablelands proper, along with varying adjoining landforms and vegetation types. Varying Barkly regions encompass: An area from Dunmarra south to Barrow Creek, and from the Tanami desert to the Queensland border. The Barkly Tableland proper, the asso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert Pavement
A desert pavement, also called reg (in western Sahara), serir (in eastern Sahara), gibber (in Australia), or saï (in central Asia) is a desert surface covered with closely packed, interlocking angular or rounded rock fragments of pebble and cobble size. They typically top alluvial fans. Desert varnish collects on the exposed surface rocks over time. Geologists debate the mechanics of pavement formation and their age. Formation Several theories have been proposed for the formation of desert pavements. A common theory suggests that they form through the gradual removal of sand, dust and other fine-grained material by the wind and intermittent rain, leaving the larger fragments behind. The larger fragments are shaken into place through the forces of rain, running water, wind, gravity, creep, thermal expansion and contraction, wetting and drying, frost heaving, animal traffic, and the Earth's constant microseismic vibrations. The removal of small particles by wind does not co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salt Pan (geology)
Natural salt pans or salt flats are flat expanses of ground covered with salt and other minerals, usually shining white under the sun. They are found in deserts and are natural formations (unlike salt evaporation ponds, which are artificial). A salt pan forms by evaporation of a water pool, such as a lake or pond. This happens in climates where the rate of water evaporation exceeds the rate of that is, in a desert. If the water cannot drain into the ground, it remains on the surface until it evaporates, leaving behind minerals precipitated from the salt ions Solution (chemistry), dissolved in the water. Over thousands of years, the minerals (usually salts) accumulate on the surface. These minerals reflect the sun's rays and often appear as white areas. Salt pans can be dangerous. The crust of salt can conceal a quagmire of mud that can engulf a truck. The Qattara Depression in the eastern Sahara Desert contains many such traps which served as strategic barriers during World War ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deserts And Xeric Shrublands
Deserts and xeric shrublands are a biome defined by the World Wide Fund for Nature. Deserts and xeric (Ancient Greek 'dry') shrublands form the largest terrestrial biome, covering 19% of Earth's land surface area. Ecoregions in this habitat type vary greatly in the amount of annual rainfall they receive, usually less than annually except in the margins. Generally evaporation exceeds rainfall in these ecoregions. Temperature variability is also diverse in these lands. Many deserts, such as the Sahara Desert, Sahara, are hot year-round, but others, such as East Asia's Gobi Desert, become quite cold during the winter. Temperature extremes are a characteristic of most deserts. High daytime temperatures give way to cold nights because there is no insulation provided by humidity and cloud cover. The diversity of climatic conditions, though quite harsh, supports a rich array of habitats. Many of these habitats are ephemeral in nature, reflecting the paucity and seasonality of avail ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semi-desert
A semi-arid climate, semi-desert climate, or steppe climate is a dry climate sub-type. It is located on regions that receive precipitation below potential evapotranspiration, but not as low as a desert climate. There are different kinds of semi-arid climates, depending on variables such as temperature, and they give rise to different biomes. Defining attributes of semi-arid climates A more precise definition is given by the Köppen climate classification, which treats steppe climates (''BSh'' and ''BSk'') as intermediates between desert climates (BW) and humid climates (A, C, D) in ecological characteristics and agricultural potential. Semi-arid climates tend to support short, thorny or scrubby vegetation and are usually dominated by either grasses or shrubs as they usually cannot support forests. To determine if a location has a semi-arid climate, the precipitation threshold must first be determined. The method used to find the precipitation threshold (in millimeters): * mu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Advertiser (Adelaide)
''The Advertiser'' is a daily Tabloid (newspaper format), tabloid format newspaper based in the city of Adelaide, South Australia. First published as a broadsheet named ''The South Australian Advertiser'' on 12 July 1858,''The South Australian Advertiser'', published 1858–1889 , National Library of Australia, digital newspaper library. it is currently a tabloid printed from Monday to Saturday. ''The Advertiser'' came under the ownership of Keith Murdoch in the 1950s, and the full ownership of Rupert Murdoch in 1987. It is a publication of Advertiser Newspapers Pty Ltd (ADV), a subsidiary of News Corp Australia, itself a subsidiary of News Corp. Through much of the 20th century, ''The Advertiser'' was Adelaide's morning broadsheet, ''The News (Adelaide), The News'' the afternoon tabloid, wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australian Broadcasting Corporation
The Australian Broadcasting Corporation (ABC) is Australia’s principal public service broadcaster. It is funded primarily by grants from the federal government and is administered by a government-appointed board of directors. The ABC is a publicly-owned statutory organisation that is politically independent and accountable; for example, through its production of annual reports, and is bound by provisions contained within the Public Interest Disclosure Act 2013 and the Public Governance, Performance and Accountability Act 2013, with its charter enshrined in legislation, the ''Australian Broadcasting Corporation Act 1983''. ABC Commercial, a profit-making division of the corporation, also helps generate funding for content provision. The ABC was established as the Australian Broadcasting Commission on 1 July 1932 by an Act of Federal Parliament. It effectively replaced the Australian Broadcasting Company, a private company established in 1924 to provide programming for A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soil
Soil, also commonly referred to as earth, is a mixture of organic matter, minerals, gases, water, and organisms that together support the life of plants and soil organisms. Some scientific definitions distinguish dirt from ''soil'' by restricting the former term specifically to displaced soil. Soil consists of a solid collection of minerals and organic matter (the soil matrix), as well as a porous phase that holds gases (the soil atmosphere) and water (the soil solution). Accordingly, soil is a three- state system of solids, liquids, and gases. Soil is a product of several factors: the influence of climate, relief (elevation, orientation, and slope of terrain), organisms, and the soil's parent materials (original minerals) interacting over time. It continually undergoes development by way of numerous physical, chemical and biological processes, which include weathering with associated erosion. Given its complexity and strong internal connectedness, soil ecologists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australia
Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller islands. It has a total area of , making it the list of countries and dependencies by area, sixth-largest country in the world and the largest in Oceania. Australia is the world's flattest and driest inhabited continent. It is a megadiverse countries, megadiverse country, and its size gives it a wide variety of landscapes and Climate of Australia, climates including deserts of Australia, deserts in the Outback, interior and forests of Australia, tropical rainforests along the Eastern states of Australia, coast. The ancestors of Aboriginal Australians began arriving from south-east Asia 50,000 to 65,000 years ago, during the Last Glacial Period, last glacial period. By the time of British settlement, Aboriginal Australians spoke 250 distinct l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Australian Current
The West Australian Current (or the Western Australian Current) is a cool surface current of the Southern Ocean and Southern Indian Ocean. Track It starts as the Southern Indian Ocean Current, a part of the larger Antarctic Circumpolar Current (also known as the West Wind Drift). As the current approaches Western Australia, it turns north, parallel to the western coast of Australia, and becomes the West Australian Current. Effects The current is mainly seasonal, being weaker in winter and stronger in summer, and is affected by the winds in that area. In addition to the West Australian Current flowing on the Western Australian Coast, the Leeuwin Current and Southern Australian Countercurrent, also flow along this coast, with the former flowing in the opposite direction. These three currents together contribute greatly to the rainfall and climate in the southwest region of Western Australia.http://www.bom.gov.au/oceanography/forecasts/idyoc10.shtml?region=10&forecast=1 BOM ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evapotranspiration
Evapotranspiration (ET) refers to the combined processes which move water from the Earth's surface (open water and ice surfaces, bare soil and vegetation) into the Atmosphere of Earth, atmosphere. It covers both water evaporation (movement of water to the air directly from soil, Canopy interception, canopies, and water bodies) and transpiration (evaporation that occurs through the stomata, or openings, in plant leaves). Evapotranspiration is an important part of the local water cycle and climate, and measurement of it plays a key role in water resource management Irrigation, agricultural irrigation. Definition ''Evapotranspiration'' is defined as: "The combined processes through which water is transferred to the atmosphere from open water and ice surfaces, bare soil and vegetation that make up the Earth’s surface." Evapotranspiration is a combination of evaporation and transpiration, measured in order to better understand crop water requirements, irrigation scheduling, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
