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Search results 371 - 380 of 1458 matching essays
- 371: Dinosaurs
- ... kinds of organisms is not known; it must, however, have involved major changes in the environment. Their extinction has been attributed to many causes, including cosmic radiation, exploding supernova, world-wide fluctuations in sea level, acid rain caused by volcanic activity, climatic change, and continental drift. Independent evidence indicates that sea levels did fall and temperatures dropped at the end of the Mesozoic Era, a time when continents were drifting apart and ...
- 372: The Great Gatsby: Being Successful
- ... Perrin brings up is that America was found green, opportune. For the most part people think that it will stay forever that way
that is why the majority of us dont really worry about acid rain, or recycleing
. Im not quite sure what point he is trying to make by saying this but I believe that he is trying to say that America will forever see itself as a nation ...
- 373: Pulmonary Agents
- ... It has a characteristic odor of sweet, newly mown hay. MECHANISM OF TOXICITY Phosgene is only slightly soluble in water and aqueous solutions. However, once dissolved it rapidly hydrolyzes to form carbon dioxide and hydrochloric acid. The early-onset ocular, nasal, and central airway irritation from high concentrations of phosgene is caused by hydrochloric acid released during phosgene hydrolysis; however, the carbonyl group (C=O) readily participates in acylation reactions with amino (-NH2), hydroxyl (-OH), or sulfhydryl (-SH) groups and these reactions account for the major pathophysiological effects of phosgene ... breath, individuals exposed to particularly high concentrations of organohalides may report symptoms associated with mucous membrane irritation. Exposure to large quantities of phosgene may irritate moist mucous membranes, presumably because of the generation of hydrochloric acid from the hydrolysis of phosgene. Transient burning sensation in the eyes with lacrimation and chemical conjunctivitis may coexist with mild, early-onset cough and a substernal ache with a sensation of pressure. Irritation of ...
- 374: The War Between the States
- ... during the mid-morning hours of the 12th. With a cheer and at the double quick, McGowan's Brigade advanced towards the tip of the mule- shoe in support of Harris's Brigade, sloshing through rain and mud and under heavy fire. At the head of each of the brigade's five regiments, two soldiers carried the regimental state flag and the national battleflag. The blue silk state flag featured a ... two sides were only a few yards apart. Now and then a hundred or so Yankees would surge forward over the Confederate trenches, only to be immediately hurled back in desperate hand-to-hand fighting. Rain fell intermittently during the afternoon of the 12th, adding to the misery of the combatants. About 10 o'clock that evening, a large oak, some 22 inches in diameter and cut almost in half by ... at age 42. According to Elizabeth Hard, her Great Uncle Charles "died without fame or glory, as on an early morning walk he suffered an [epileptic] attack and fell in a pool of water from rain collected on the pavement." The man who had survived the Bloody Angle at Spotsylvania drowned back home in a few inches of ground water. The story of the flag that Charles Whilden carried so ...
- 375: A Beginning and End
- ... two of which are spring with its new beginning and autumn with its incipient decline. I. Spring A. Daylight B. Gardens C. Insects D. Color E. Nests F. Migratory birds G. Coats of animals H. Rain II. Autumn A. Daylight B. Gardens C. Insects D. Color E. Nests F. Migratory birds G. Coats of animals H. Rain Each change and occurence that takes place during each season is so important to the outcome of the next, because the seasons are all entwined. The activities which are common to each season have a ... their young. The migratory foul take flight in their V-shaped formation in search of a warmer climate. Furry and feathery creatures have now replaced their spring attire with fuller, heavier coats and feathers. Less rain falls since less is needed. The excitement diminishes as the preparation of rest takes place. Many events have taken place throughout the year, some obvious and some never acknowledged, but all are remarkable. The ...
- 376: Environmental Issues Associated With Vehicle Use
- ... pollution, particularly particulates from vehicles, are linked to increasing respiratory problems including asthma and this air pollution is thought to cause up to several thousand deaths and up to 20,000 hospital admissions every year. Acid rain is another serious problem, helped along with the increased usage of motor cars. The increased acidity of the precipitation is down to contamination by carbon dioxide, sulphur dioxide and nitrogen oxide, all of which the ...
- 377: Deforestation
- ... to sophisticated natural medicines, and from high- tech wood based manufactures to paper products. Environmental benefits include water flow control, soil conservation, and atmospheric influences. Brazil's Amozonia contains half of the world's tropical rain forests. The forests cover a region 10 times the size of Texas. Only about 10% of Brazil's rain forests have been cut to date, but cutting goes on at an uncontrollable rate. Since pre-agricultural times the world's forests have declined one fifth from 4 to 3 billion hectares. Temperate forests have ... their forests. Tropical deforestation has various direct causes: The permanent conversion of forests to agricultural land, logging, demand for fuelwood, forest fires and drought. Slash and burn clearing is the single greatest cause of tropical rain forest destruction world wide. Air pollution is also a major threat to the forests in the northern hemisphere and is expected to increase. Reduced growth, defoliation and eventual death occur in most affected forests. ...
- 378: Effects of Deforestation
- ... attributed to deforestation (Delfgaauw, 1996). "Edge effects" are the destruction or degradation of natural habitat that occur on the fringes of fragmented forests. The effects for the animals include greater exposure to the elements (wind, rain etc
), other non-forest animals and humans (Dunbar, 1993). This unnatural extinction of species endangers the world's food supply, threatens many human resources and has profound implications for biological diversity. Another negative environmental impact ... global warming phenomenon which is also directly related to the declining amounts of forest areas on the earth. Soil erosion caused by deforestation is also a major concern among even the most amateur environmentalists: "When rain falls, some may sink to the ground, some may run off the surface of the land, and flowing down towards the rivers and some may evaporate. Running water is a major cause of soil erosion ... enough (Hamilton and Pearce, 1987). Some areas also become "unbalanced" with the removal of tree roots as this removal can cause serious mud slides and unstability which can be seen in the in the tropical rain forests of Australia (Gilmour et al., 1982; as cited in Hamilton and Pearce, 1987) and Malaysia (Peh, 1980; as cited in Hamilton and Pearce, 1987). It should be mentioned that recent logging techniques have ...
- 379: Dante's Peak
- ... noticed that the lake near Grandmother's house becomes acidic quite fast in the movie, but hey, you need to pack a lot into a movie these days to draw a crowd. There are very acid lakes around volcanoes and yes, you would not want to swim in them... and yes metal parts can corrode in acid lakes; a thin metal cable might dissolve on a movie timescale. The acids may be sulfuric and hydrochloric acid, plus others, and the acidity (roughly measured by how low the pH is) can be quite high, hundreds to thousands of times as acidic as lemon juice or vinegar, or EVEN Coca Cola! A ...
- 380: Rodin's "The Kiss"
- ... the model. The bronze cools and dries very quickly. Once cooled, the inner can be cleaned and the flasked sections can be removed. The statue itself is then cleaned with a dilute solution of nitric acid, and rinsed with water to inhibit corrosion potentially caused by the acid. There is also a very simple method of casting for complex figures called the lost wax method. Using the original clay model, wax is modeled around the clay. The amount of wax used is dependent ... Kiss as seen in the intricate muscularity of the figures. (Hodges p.78) The statue can be colored after it is bronzed in a process called patination. This artificial coloring is done by applying diluted acid and water to the heated statue, which actually corrodes the statue to a desired color. The solution is usually applied with a brush, and adds a protective layer to the statue. The Kiss is ...
Search results 371 - 380 of 1458 matching essays
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