Xem 1-20 trên 20 kết quả Lake surfaces
  • Environmental problems usually develop from the interactions of people, consumption, and resources. Increasing population, increasing consumption and limited resources exacerbate these problems. One concern that heads the list of critical problems is the availability of clean, fresh, surface water. It is the basis of the existence of human societies and economies. Fresh water is essential for many forms of life, is required by humans for drinking, agriculture, and most industrial processes, and plays a prominent role in our recreational activities....

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  • Africa is the second largest continent in the world. The world’s biggest desert, the Sahara, dominates the landscape of the north, while in the south forests and vast grasslands are home to wild animals, such as leopards, lions, and elephants. The Great Rift Valley, one of the Earth’s major geological features, runs from the Red Sea down to Mozambique. This huge crack in the Earth’s surface, caused by a series of faults, is made up of mountains, volcanoes, deep valleys, and lakes.

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  • Over the past few decades numerous studies have shown an alarming increase in the concentration of atmospheric particular matter called aerosols resulting from a variety of human activities, ranging from agricultural to combustion of fossil fuels. Besides having serious impacts on the health of all living creatures, these particles can affect planetary radiation budget. Consequences of this change include global temperature shifts and the altering of atmospheric and oceanic circulation patterns.

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  • Coast this complex with numerous sheltered embayments, islands and estuaries have increased the formation the extensive wetlands especially in Saginaw Bay, St Marys River, and east of Georgian Bay. This complexity, coupled with diverse geological clock, making the most of wetlands diversity on the Great Lakes (Smith et al. 1991). The coastal wetlands are used as spawning, nursery areas and nurtured by a series of arbitrary force and wetland dependent.

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  • Tham khảo sách 'atmospheric aerosols – regional characteristics – chemistry and physics_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • From the early explorers onwards, visitors to the Arctic and to Antarctica have commented with great interest on the presence of lakes, wetlands, and fl owing waters. These environments encompass a spectacular range of conditions for aquatic life, from dilute surface melt ponds, to deep, highly stratifi ed, hypersaline lakes.

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  • A classic example of a water system severely affected by hu- man development is the Aral Sea, fed by the Amu Darya and Syr Darya. The Aral Sea was once the fourth largest inland body of water in the world, after Lake Superior, supporting 24 unique species of fish and a large fishing population. The Soviet Union built a series of dams and irrigation systems to divert river flows in order to grow cotton on around 3 million hectares of new farmland, but these massive freshwater withdrawals (first order impacts) led to the shrinking of the Sea and a corresponding increase in...

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  • Many have endeavored to make our outdoor environment cleaner and safer. The learning process that occurred showed us the limitations of our planet and also the sustainability of our ecosystem if given a chance. As a community, we learned about the water, the soil, and the air. We learned about the underground river that flowed to the surface lake. We learned about air currents that transported airstreams around our globe. We discovered the reality of plate tectonics and the ever-changing hydrogeological system.

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  • Limitations on the availabilityof water resourcesareamong the greatest challenges facing modern society, despite the fact that roughly 70% of the earth’s surface is covered by water. Human society depends on liquid freshwater resources to meet drinking, sanitation and hy‐ giene, agriculture, and industry needs.Roughly 97% of the earth’s surface and shallow sub‐ surface water is saline and about 2% is frozen in glaciers and polar ice.

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  • PART 2 Mercury Concentrations in Field Collections of Abiotic Materials, Plants, and Animals © 2006 by Taylor & Francis Group, LLC CHAPTER 5 Mercury Concentrations in Abiotic Materials Mercury burdens in sediments and other nonbiological materials are estimated to have increased up to five times prehuman levels, primarily as a result of anthropogenic activities (USNAS, 1978). Maximum increases are reported in freshwater and estuarine sediments and in freshwater lakes and rivers, but estimated increases in oceanic waters and terrestrial soils have been negligible (USNAS, 1978).

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  • Wet sulfate deposits: eastern North America. (Source: Environment Canada SOE 96-2, Spring 1996.) LK P, P0 S r, Dr t = reactivity index = pressure, Pa = surface area of the test panel, m2 = distance, m = time, s Pa, Pb = pressure, Pa W, W0 = power, pW Acoustic Enclosures, Turbine A-13 FIG. A-7 Trends in lake sulfate levels (North America). (Source: Environment Canada SOE 96-2, Spring 1996.

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  • Water is the most precious commodity- but paradoxically abundant enough for its true value to be overlooked or under appreciated (about 80% of the Earth surface is covered by water) in those areas of the earth where water is scarce, issues surrounding Its use is a matter of life and death oftenly leading to conflicts between the riparian and any interested party. Eg.the pastoral communities and in the Middle East over the use of the River Jordan waters. Lake Naivasha is in Naivasha municipality Naivasha Division, Nakuru District in Rift Valley Province in Kenya.

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  • ASEAN’s Rich Biodiversity Despite occupying only three percent of the earth’s surface, the ASEAN region hosts 20 percent of all known species that live deep in the region’s mountains, jungles, rivers, lakes and seas. .

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  • "Nelson Mandela Portrait in Watercolour" Cadmium Cerulean Burnt Yellow Blue Umber Blue Black Quinacridone Gold Geranium Lake Bluish Payne's Grey Additional colour (not shown) - Prussian blue Equipment 1. PAPER - Stretched sheet of watercolour paper (mine is Saunders Waterford 300g Rough Surface). 2. PAINT - Winsor & Newton Artists' Watercolour tubes Cadmium Yellow, Cerulean Blue, Burnt Umber, Blue Black, Quinacridone Gold. Lukas Artist's Watercolour tubes - Geranium

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  • Diving for bodies was not one of Scott Markman’s favorite things. He gazed across the open water at the big orange ball creeping up over the forest horizon. A passing Florida breeze rippled the glassy lake-top and caused swirls within the fading layer of fog lingering at the water’s surface. Markman found himself wishing he were somewhere else. Kneeling awkwardly on the flexible, black bottom of the rubber boat, he wormed the new regulator mouthpiece back into his sore mouth and sucked test air from the fresh aluminum tank. With his left hand he wiggled the black wrap-around mask down...

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  • Despite occupying only three percent of the earth’s surface, the ASEAN region hosts 20 percent of all known species that live deep in the region’s mountains, jungles, rivers, lakes and seas. The region includes three mega-diverse states (Indonesia, Malaysia, and the Philippines); several bio-geographical units (e.g., Malesia, Wallacea, Sundaland, Indo-Burma and the Central Indo-Pacific); and numerous centers of concentration of restricted-range bird, plant and insect species.

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  • Many of the Earth’s elements travel or cycle through the natural environment. This means that they are transported from the soil into nearby lakes and rivers, and then evaporate from the water into the air, to be transported by wind and eventually re-deposited to the surface where the cycle starts over again. Mercury cycles through the environment in this way (see Figure 5). An atom of mercury may begin its journey by being eroded from rocks on the shore of a lake or by being vented into the atmosphere as mercury vapour from a volcanic eruption. These are natural emissions.

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  • e elevated water table is a prominent feature of the Florida ecosystem. Frequent surface appearance of the aquifer has produced a patchwork of wetlands, streams, rivers and lakes.This presents an issue for the efficient extraction of the phosphate rock deposit by draglines. If the opencast pit contains water, dragline operators have difficulty identifying the boundary between the ore and overburden, potentially result- ing in the loss of ore or dilution by barren rock.

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  • North-West Donegal. A fine afternoon in September. The mountain ranges were bathed in sunshine and the scarred and seamy face of stern old Errigal seemed almost to smile. A gentle breeze stirred the air and the surface of the lakes lay shimmering in the soft autumnal light. The blue sky, flecked with white cloudlets, the purple of the heather, the dark hues of the bogs, the varied greens of bracken, ferns and grass, the gold of ripening grain, and the grey of the mountain boulders, together formed a harmony of colour which charmed the eye and soothed the mind.

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  • "What do you make of it?" Commander Jed Hargraves asked huskily. Ron Val, busy at the telescope, was too excited to look up from the eye-piece. "There are at least two planets circling Vega!" he said quickly. "There may be other planets farther out, but I can see two plainly. And Jed, the nearest planet, the one we are approaching, has an atmosphere. The telescope reveals a blur that could only be caused by an atmosphere. And—Jed, this may seem so impossible you won't believe it—but I can see several large spots on the surface that are almost certainly lakes.

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