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» Browse Science and Environment Term Papers
The Problems With Acid Rain
Number of Words: 1834 / Number of Pages: 7
... very large. Detecting an acid lake is often quite difficult. A lake does not become acid over night. It happens over a period of many years, some times decades. The changes are usually to gradual for them to be noticed early.
At the beginning of the 20th century most rivers/lakes like the river Tovdal in Norway had not yet begun to die. However by 1926 local inspectors were noticing that many of the lakes were beginning to show signs of death. Fish were found dead along the banks of many rivers. As the winters ice began to melt off more and more hundreds upon hundreds more dead fish (trout in particula ...
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Kevlar
Number of Words: 936 / Number of Pages: 4
... the structural requirement for the backbone is para orientation on the benzene ring, which allowed for rod-like molecular structures. This technology was used when Du Pont released aramid fiber in 1971.
What is it?
Kevlar is an aramid, a term invented as an abbreviation for aromatic polyamide. The chemical composition of Kevlar is poly para-phenyleneterephthalamide, and it is more properly known as a para-aramid. Aramids belong to the family of nylons. Common nylons, such as nylon 6, do not have very good structural properties, so the para-aramid distinction is important. The aramid ring gives Kevla ...
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Estuaries
Number of Words: 1264 / Number of Pages: 5
... until what once was land
is now water. Throughout the tides, the days and the years, an estuary is
cradled between outreaching headlands and is buttressed on its vulnerable
seaward side by fingers of sand or mud.
Estuaries transform with the tides, the incoming waters seemingly
bringing back to life organisms that have sought shelter from their temporary
exposure to the non-aquatic world. As the tides decline, organisms return to
their protective postures, receding into sediments and adjusting to changing
temperatures.
The community of life found on the land and in the water includes
mammals, bird ...
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Changes In The Earth's Environment
Number of Words: 2141 / Number of Pages: 8
... have been defined as “...extreme geophysical events greatly
exceeding normal human expectations in terms of their magnitude or frequency and
causing significant damage to man and his works with possible loss of life.”
(Heathcote,1979,p.3.). A natural hazard occurs when there is an interaction
between a system of human resource management and extreme or rare natural
phenomena (Chapman,1994). As McCall, Laming and Scott (1991) argue, strictly
speaking there is no hazard unless humans are affected in some way. Yet the line
between natural and human-made hazards is a finely drawn one and usually
ove ...
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The Invention Of The Telegram
Number of Words: 1113 / Number of Pages: 5
... call the President's attention to the fact that the ruthless employment of our submarines now follows the prospect of compelling England in a few months to make peace" - ZIMMERMANN
Considering this telegram was sent to Mexico, it shows Mexican importance in this war. Mexico had two thousand miles of undefended coastline on the Pacific . Her northern boarder with the United States stretched for twelve hundred miles from Texas to California, touching all along all along its length against territory that had once been her own. Mexicans remembered the Alamo too. Mexico was, in short, the soft underbel ...
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Early Health And Medicine
Number of Words: 419 / Number of Pages: 2
... yeast, and rabies:to name a few. Within a year of Pasteur's remedy for rabies, he treated and cured maore than 2,000 patients.
A German pathologist named Robert Kock (1843-1910) studied a disease called diptheria. Koch learned htat diptheria bacteria or bacilli could only be found in samples from a patients throat. Although Koch could not understand how diptheria was somehow affecting the victim's heart. Finally, Koch concluded that the bacilli produced a toxin that circulated the bodyand damaged heart cells. Soon Koch developed an antitoxin that both cured and prevented the disease.
Lastly, ...
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Value Of Environmental Agencies
Number of Words: 990 / Number of Pages: 4
... are
exposing isolated, once-contained people. Kathlyn Gay, author of Rainforests of
the World, mentions, “Indigenous people in many countries have died because of
contact with outsiders-usually whites of northern European extraction-who have
brought contagious diseases, ranging from measles to influenza, and sexually
transmitted disease”(20). With the importance of the land resources comes the
ever significance of the atmosphere. The atmosphere's most predictive component
is the ozone layer. The distribution of the forests and multiplying of grazing
cattle are causes immense damage to the ozone. ...
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Copper
Number of Words: 664 / Number of Pages: 3
... grade of copper ore is pale silvery gray. Miners
used to be always in danger in copper mines. Today, we have reduced a fair
amount of these hazards. Miners wear hats made of iron or very hard plastic.
This is to protect them from falling rocks. Lamps are also attached to these
helmets in case some of the lighting in the mine goes out leaving a miner
stranded in the dark. One of the biggest problems with mining is that in some
places dangerous gas’s may exist, like Carbon Monoxide. In the past we had very
cruel and inhuman ways to detect harmful gases. One of these ways was the use of
canaries. Min ...
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Global Warming 3 -
Number of Words: 2192 / Number of Pages: 8
... been in the past million years. Average global temperatures have risen 1 degree Fahrenheit over the last century. If carbon dioxide and other greenhouse gases continue to spill into the atmosphere, global temperatures could rise five to 10 degrees by the middle of the next century.
The warning will be the greatest at the higher latitudes of the Northern Hemisphere, with the largest temperature rises occurring in winter. Most areas will experience summertime highs well above 100 degrees Fahrenheit. New temperature records will be set each year.
As a possible prelude to global warming, the decade of ...
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Cloning
Number of Words: 544 / Number of Pages: 2
... we can meddle with nature in general. Furthermore, it is stressed that, whatever potential uses it may be put to at some future stage, the technique raises a long string of ethical problems.
In addition, it may be feared that within a number of years the development and application of animal techniques will lead to the testing, development and application of human . Though this notion seems very unlikely to occur within the span of the next few years, but the possibility does exist, that the techniques which are currently being used to clone animals may also be used to clone humans one day.
There ar ...
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