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» Browse Science and Environment Term Papers
The Atmospheric Ozone Layer
Number of Words: 2378 / Number of Pages: 9
... or optical devices, which
measured ozone concentrations through the depletion of UV light.
However, the need to measure ozone concentrations from the surface at regular
intervals, led to the development of the Dobson spectrophotometer in the 1960s.
The British Antarctic Survey has the responsibility to routinely monitor
stratospheric ozone levels over the Antarctic stations at Halley Bay (76°S 27°W)
and at Argentine Islands (65°S 64°W). Analysis of ozone measurements in 1984 by
a team led by John Farnam, made the startling discovery that spring values of
total ozone during the 1980-1984 peri ...
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Evolution
Number of Words: 4241 / Number of Pages: 16
... 47
CONCLUSIONS ............................................... 48
INTRODUCTION
Theories explaining biological evolution have been bandied about since the ancient Greeks, but it was not until the Enlightment of the 18th century that widespread acceptance and development of this theory emerged. In the mid 19th century english naturalist Charles Darwin - who has been called the "father of evolution" - conceived of the most comprehensive findings about organic evolution ever1. Today many of his principles still entail modern interpretation of evolution. I've assessed and interpreted ...
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The Wolf
Number of Words: 529 / Number of Pages: 2
... we know only this wolf we do not truly know the
wolf at all. And what we do not know, we fear. Our fear is perhaps the greatest
threat to the survival of the wolf, for it causes us to react rather than act,
to repel rather than respect. But this fear and hatred did not always separate
man and beast
Man the hunter once looked on the wolf the hunter with admiration. Man and
wolf both used their keen intelligence to overcome the disadvantages they faced
in their day-to-day existence. Survival for both was enhanced by hunting and
living in groups or packs. And, at one time, the chance of survival for ...
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Diabetes 2
Number of Words: 697 / Number of Pages: 3
... diabetes from the Greek word meaning excessive urination, a symptom the Greeks noticed, and mellitus, from the Latin for honey, which is because diabetic urine is filled with sugar and is sweet. Physicians and medical books use the term diabetes mellitus, but is the most commonly called diabetes. There are two major types of diabetes: type 1 and type 2. Both of them are a little different. But everyone with diabetes has one thing in common: Little or no ability to move sugar--or glucose--out of their blood into their cells, where it is the body's primary fuel. Everyone has glucose in their blood, w ...
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Depression 4
Number of Words: 2636 / Number of Pages: 10
... episodes of major depression. Mental health professionals use the term clinical depression to refer to any of the above forms of depression.
Surveys indicate that people commonly view depression as a sign of personal weakness, but psychiatrists and psychologists view it as a real illness. In the United States, the National Institute of Mental Health has estimated that depression costs society many billions of dollars each year, mostly in lost work time.
II PREVALENCE
Depression is one of the most common mental illnesses. At least 8 percent of adults in the United States experience serious de ...
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The Environmental Impact Of Eating Beef And Dairy Products
Number of Words: 1835 / Number of Pages: 7
... animal eats its way through 900 pounds of vegetation a month.
Without plants to anchor the soil, absorb the water, and recycle the nutrients,
the land has become increasingly vulnerable to wind and water erosion. More
than 60 percent of the world's rangeland has been damaged by overgrazing during
the past half century.
Cattle ranching has also been linked to Global Warming.
The grain-fed-cattle complex is now a significant factor in the emission of
three of the gases that cause the greenhouse effect- methane, carbon dioxide,
and nitrous oxides- and is likely to play an even larger role in Glob ...
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Global Warming
Number of Words: 2327 / Number of Pages: 9
... our earth.
One main reason for the problem of global warming is the burning of
fossil fuels. Fossil fuels are coal, oil and natural gases. We use these fuels
to run factories, power plants, cars, trucks, buses, air conditioning and etc.
The people of the earth are putting 5.5 billion tons of carbon, in the form of
carbon dioxide in the air every year! Seventy five percent of this is fossil
fuels.
3. Impact Causing Global Change
For many years, scientists have been predicting that our disregard for
Mother Nature would make the climatic temperature of this Earth to increase
greatly. There hav ...
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Chesapeake Bay Pollution
Number of Words: 1118 / Number of Pages: 5
... extensive study to determine the reasons for the Bay's decline. Three major problems were identified; excess nutrients from wastewater, agricultural lands, and developed land; sediment in runoff from farms, construction sites, and eroding lands; and possible elevated levels of toxic chemicals.
Nitrogen and phosphorus are considered good things because they support the bottom of the food chain. But in recent years the Chesapeake Bay has been receiving too much of these nutrients. The excess nutrients have created large blooms of microscopic plants called phytoplankton. The growth of phytoplankton has ...
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The General Effects Of Fire On
Number of Words: 1481 / Number of Pages: 6
... negatively impacted by large fires through the increase in sediment flow. Fire is essential in maintaining biological diversity in the Northern Rocky Mountain forests.
NEGATIVE EFFECTS - AQUATIC ECOSYSTEMS
Contrary to the beneficial impacts of fire on terrestrial wildlife, aquatic ecosystems are negatively affected, such as the decrease in fish populations by fire. In the North Fork Shoshone River adjacent to Yellowstone National Park, fish died from increased sediment flow during a heavy rainstorm two years after the canyon had burned (Armbruster, 1996). Fish are sensitive to sediment both in c ...
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Microwaves
Number of Words: 1380 / Number of Pages: 6
... carried
on aircraft, ships and mobile ground stations.
This characteristic of microwaves, the efficiency with which they are
concentrated in a narrow beam, is one reason why they can be used in
cooking. You can produce a high-powered microwave beam in a small oven,
but you can't do the same with radio waves, which are simply too long.
Microwaves and their Use
The idea of cooking with radiation may seem like a fairly new one, but in
fact it reaches back thousands of years. Ever since mastering fire, man
has cooked with infrared radiation, a close kin of the microwave.
Infrared rays are wha ...
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