| Papers [166-180] of 387 :: [Page 12 of 26] | | Go to page : <— 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 —> | |
|
|
Evolutionary Mass Extinctions, 2002.
This paper discusses in detail the changes in environment over time that caused mass extinction of animals such as the dinosaurs.
4,290 words (approx. 17.2 pages), 7 sources, MLA, $ 113.95
»
Click here to show/hide summary
Abstract
This paper explains that the fossil records tell us that, through out the geological history of earth, mass extinctions have been the norm rather than the exception. This paper states that a better understanding of the role extinction plays in evolution is essential. The author concludes that human beings are uniquely adaptable; they invent procedures as medicine that give them extended control over their environments.
From the Paper
"Of course, the most famous extinction event is that of the dinosaurs, about 65 million years ago. Such events appear in the fossil record as far back as Precambrian time when it is believed that life first began. Ideas of mass extinction has been an issue of controversy between many geologists towards the idea that it is related to intermittent catastrophes such as the striking of the earth's surface by a large asteroid or comet. Many paleontologists and evolutionary theorists reject such ideas and believe them to be unjustified."
| |
|
Plate Tectonics, 2002.
A paper that identifies and argues that plate tectonics is responsible for changing continental landmasses through geological occurrences
2,650 words (approx. 10.6 pages), 19 sources, MLA, $ 79.95
»
Click here to show/hide summary
Abstract
This paper help explains how Plate Tectonics has caused changes in continental landmasses through geological occurrences. It presents the main controversy in the Plate tectonic theory - whether the movement of the plates has displaced landmass across the continents or not and whether it is the sole reason for the change of the landmass or it is through atmospheric influence.
From the Paper
"Thousands of years ago the earth?s surface has been hypothesized as one big landmass. The Earth's surface has been constant motion. ?Fragmented into giant sheets of solid rock that glide atop a layer of hotter, more pliable material, the globe's appearance is forever changing.? [Cowen, 1999] . These plates are semi rigid, floated on flow of mantle. The plates measured around 50 miles, thickness of 25 miles on land and 4 miles thick under the oceans. Their movement was categorized by an average of a few inches a year. Even today, geologists and tectonicists hypothesize the earth to continue this movement in similar slow manner, even if we do not notice it. The plates? movement is called the Plate Tectonic Theory, a theory presented in 1912 but upheld in 1960 . "
| |
|
Underwater Acoustics, 2002.
A discussion on underwater acoustics and acoustic energy used to detect objects in the oceans or sea beds.
1,375 words (approx. 5.5 pages), 6 sources, MLA, $ 45.95
»
Click here to show/hide summary
Abstract
The following paper discusses acoustics signals that detect the presence and location of commercially useful fish, map the ocean floor to establish the safest paths for supertankers, explore the earth?s geological formations and discover oil deposits in the ocean floor.
From the Paper
"At a bottom of the permanent thermocline or below it, water temperature is uniform. Here, the pressure of the water column due to the depth takes over. The sound speeds then increase on account of increase in pressure. (Pacific) The deep sound channel axis is between 600 and 1,200 m below the sea surface at low and middle latitudes. This is deepest in the subtropics and come to the surface in high latitudes, where sound propagates in the surface layer. (Pacific)
Sound waves can be ?trapped? in the deep sound channel and propagate in long distances. This is because these waves go through little attenuation beyond that, and this is due to geometric scattering or spread as well as minor volume scattering in water."
| |
|
Potassium Argon and the Archaeologist, 2002.
A insight into the role of potassium argon dating within the field of archaeology.
760 words (approx. 3.0 pages), 5 sources, MLA, $ 27.95
»
Click here to show/hide summary
Abstract
There are many techniques for dating within the field of archaeology, one of these methods is the The K-Ar (Potassium-Argon) method which has been a vast success within the field of geology. This paper examines how it works and what methods are used to glean the date from archaeological artifacts and remains.
From the Paper
"It is possible to date rocks with a low potassium content such as basalts in this way. Sadly the dates are not always secure due to the behaviour of the geochemicals of the parent and daughter elements as they are likely to being disturbed by geological events such as weathering or reheating that normally take place during the formation of a rock. Potassium argon dating allows scientists to date volcanic rocks between two billion and 100,000 years old."
| |
|
The Greenhouse Effect, 2002.
An analysis of an article that appeared in the "New York Times" about the melting of the polar ice caps.
900 words (approx. 3.6 pages), 4 sources, MLA, $ 31.95
»
Click here to show/hide summary
Abstract
This paper discusses whether or not the greenhouse effect is really responsible for the earth's warming over the last century. It brings up the theory that perhaps this a part of the earth's natural cycle. This paper then discusses the Milankovitch Cycles which details the natural changes that the earth undergoes and the effect of these changes on the environment. The author feels that this theory, as presented in the article, disproves the greenhouse effect theory.
From the Paper
"The same happens in reverse in a time of high temperatures.
The ocean circulation systems redistributes heat better and this accounts for the speed of the ice melting in the Antarctic.
Milankovitch Cycles are than able to explain the temperature differences noted in the Antarctic. The ice melting is a direct result of this rise in temperature. The higher temperatures effecting the ocean circulation system also adequately explains why the ice melts at a fast rate."
| |
|
Mars, 2002.
An exploration of the Martian terrain, with reference to the presence of water.
1,620 words (approx. 6.5 pages), 6 sources, APA, $ 52.95
»
Click here to show/hide summary
Abstract
This paper is introduces and discusses features of the Martian terrain suggesting that water, and possibly life, may have been present in the distant past or that water exists today under the planet?s surface. Conclusions about this suggestion are made at the end of the paper.
From the Paper
"The public?s fascination and with the red planet originated with Percival Lowell?s book, ?Mars,? published in 1895. Although Schiaparelli and others had discussed the possibility of Canals on Mars, Lowell?s drawings and his suggestion of intelligent life on Mars thrilled the public."
| |
|
The Climate of the U.S.A. and Canada, 2002.
A discussion of the climate of the U.S.A. and Canada, with respect to climate classifications, its effects on farming and other activities.
2,405 words (approx. 9.6 pages), 10 sources, APA, $ 73.95
»
Click here to show/hide summary
Abstract
This paper discusses how climate governs the entire ecological structure of the planet earth. The author examines how climate, in relation to the topography and latitudinal location, determines the vegetative types, the hydrology, soil, agriculture and various human activities.
From the Paper
?Climate represents a long term average of various weather features such as temperature and precipitation. The World Meteorological Organization uses 30-year averages to define climatological "normals" for these various features. Climate determines how resources such as water and vegetation are distributed and, until the onset of technology, climate also determined where people lived and worked. Many factors, such as topography, proximity to large bodies of water, and latitude affect a particular location's long-term climate. It is important to note that because a region's climatology is a 30-year average, significant year to year variability is likely. For example, a particular location may have a dry, warm winter one year and a record snowfall the next year.?
| |
|
The Ice Age and Climatic Change, 2002.
A look at this dramatic era from an ecological point of view with focus on Milankovitch's Theory of Climatic Change.
980 words (approx. 3.9 pages), 1 source, MLA, $ 34.95
»
Click here to show/hide summary
Abstract
An examination of Milankovitch's theory which links the climate to seasonal and latitudinal variations in the solar energy received by the Earth. Through this theory we are given a better understanding of this time period. Criticism of the theory is also discussed and problems analyzed.
From the Paper
"An ice age is a cool period in Earth history, where much of the Earth's land surface is covered by ice. What is most relevant here is that an ice age is defined by the lower temperatures, with the ice a symptom of this. An ice age then, can be defined as a period when climatic changes produce lower temperatures, which in turn cause the Earth to be covered by large sheets of ice."
| |
|
"When an Earthquakes Strikes", 2001.
This paper narrates the first five days in the life of a public information officer after an earthquake strikes.
1,550 words (approx. 6.2 pages), 2 sources, MLA, $ 50.95
»
Click here to show/hide summary
Abstract
This paper gives a detailed first person account of the earthquake in Santa Clarita, California from the eyes of a public information officer. It describes the policies such as: activating the Emergency Alert System, restoring power and more. It details the responses that were received by disaster relief personnel and how several organizations of emergency workers were able to deal with this crisis.
From the Paper
"On Thursday the 15th of last month, at 7:31 a.m., an earthquake of 5.9 Moment Magnitude struck Southern California. The epicenter was near Santa Clarita, a small suburban community about twenty miles north of Los Angeles along the I-5 freeway. I am the Public Information Officer for the Emergency Response Office for the City of Santa Clarita. The following is an account of the five days following that earthquake."
| |
|
Dinosaur Extinction, 2001.
This paper examines the current theories and explanations surrounding the extinction of dinosaurs.
1,630 words (approx. 6.5 pages), 5 sources, APA, $ 53.95
»
Click here to show/hide summary
Abstract
This paper looks at the numerous theories that have been presented over time regarding the reason for dinosaur extinction. The author discusses explanations such as a sudden catastrophic event, like a meteor hitting the earth or a volcanic eruption, and also slow, environmental causes like global warming or shifting plate tectonics.
From the Paper
"First, around the time of the mass extinction of the dinosaurs there was a global climate change. During this time, the environment changed from the warm and mild one present in the Mesozoic era to the cooler one of the Cenozoic. Second, evidence exists to support a massive terrestrial disturbance at the end of the Cretaceous period that included soot in the air, acid rain, the emission of poisonous gases, and a cooling similar to that of a nuclear winter. This terrestrial disturbance caused periods of darkness on the earth as well as a global greenhouse effect. Third, the dinosaurs were only one species that became extinct during this time. According to scientific evidence, approximately 60 percent of all species below the line of the K-T boundary did not exist above that line."
| |
|
Permeability and its Relation to Soil and Rock Parameters, 2008.
A discussion on soil permeability and its relation to soil and rock parameters.
1,359 words (approx. 5.4 pages), 3 sources, MLA, $ 45.95
»
Click here to show/hide summary
Abstract
This paper examines how the permeability of soil affects soil and rock parameters. The author explains porosity in soil and discusses how the ratio or air, water and clay in soil affect its parameters. The paper defines several soil types and discusses the characteristics of each soil classification. The paper also examines external and human factors that can alter the characteristic of soil. The paper then discusses aquifers and ground water and explains how this information, when used with a good knowledge of soil porosity and permeability, can be a great tool for having and maintaining an adequate amount of water for people. Figures are included in this paper.
From the Paper
"Consequently, identifying the presence of these two regions containing soils that can readily retain moisture is extremely significant. This is because this data is imperative for the purposes of not only measuring the moisture capacity of the soil itself but in assessing accurately the potentiality for leaching through the addition of agricultural chemicals added."
| |
|
Was the Apollo Moon Landing a Conspiracy Hoax?, 2008.
A look at the possibility that the first landing on the man was an elaborate hoax pulled off by the US Government.
1,946 words (approx. 7.8 pages), 17 sources, MLA, $ 61.95
»
Click here to show/hide summary
Abstract
This paper discusses what has come to be known as 'possibly the greatest hoax the U.S. government has conspired' - namely the first man landing on the moon. The author reviews the facts surrounding the issue together with a literature review of those that claim it was all a hoax.
From the Paper
"Let's rewind, back to the year, 1969. This was the year that the "globally accepted" American heroes, Neil Armstrong and Buzz Aldrin made history. Two astronauts were the first humans to land on the moon. The excitement was watched worldwide as the American flag was inserted into the surface of the moon. The words declared in 1961 by John F. Kennedy had prevailed. "I promise America.... America will land on the moon by the end of the century!"(Braeuing). The United States has defeated Russia (formerly known as the USSR) on the race to the moon. As people reflected about the great technological advances, one thought was forgotten. Can all of this really be realistic? Could America really accomplish an achievement that seemed flawless? Let's read in between the lines, and take a deeper look into reality. This can possibly be the greatest hoax the U.S. government has conspired. Open your eyes to an Apollo moon landing conspiracy theory. "Houston, we have a problem!"
| |
|
Plate Tectonics in California, 2006.
A study of plate tectonic activity and earthquakes in the state of California.
1,680 words (approx. 6.7 pages), 12 sources, MLA, $ 54.95
»
Click here to show/hide summary
Abstract
This paper takes a look at the tectonic plates effecting seismic activity in the state of California. The paper focuses on the Pacific plate and the North American plate, two adjacent plates moving in opposite directions, which form the San Andreas fault in California. The paper points out that plate tectonics play a major role in the various geological processes found in California, especially in relation to earthquakes and the San Andreas fault. The paper concludes that this plate tectonic activity has brought about much beauty and splendor, while also making the state a very dangerous and unpredictable place to live.
Table of Contents:
Introduction
The Geology of Plate Tectonics
The San Andreas Fault
Tectonic Activity in California
The Loma Prieta Earthquake
Conclusion
From the Paper
"One important part of the San Andreas fault is known as the Coachella Valley Segment and in June of 1992, the Landers earthquake, measuring 7.4 on the Richter scale, alerted geologists to the potential of a large-magnitude quake somewhere in the Los Angeles area. The Landers quake place much scientific focus on the clustering of quakes and tectonic activity close to the Coachella Valley segment of the fault. Thus, many geophysicists have been increasingly concerned with the high number of quakes and amount of tectonic movement occurring so close together on the northern end of the segment. In 1985, several geological investigators determined that a magnitude 7.5 earthquake along or on the Coachella segment could possibly trigger the so-called "Big One," yet if such a scenario occurred on the next segment north and west of the Coachella segment, the heavily-populated city of San Bernardino could experience massive destruction. In addition, a rupture of this segment could conceivably continue in line past Los Angeles and produce a quake measuring 8.0 on the Richter scale (Nance, 1988, p. 174)."
| |
|
Desalination Processes, 2008.
This paper explores Perth, Australia's reverse osmosis desalination plant.
1,278 words (approx. 5.1 pages), 5 sources, APA, $ 43.95
»
Click here to show/hide summary
Abstract
The paper looks at the three main mechanical processes of desalination commonly used today: electrodialysis reversal, thermal desalination and reverse osmosis. The paper discusses how the preexisting water supply was not enough for Perth, Australia to handle all the new people moving to the city. The paper describes how Perth began using the desalination process of reverse osmosis to treat its seawater. The paper examines the problems of costs and energy sources as well as their solutions. The paper concludes that Perth's new reverse osmosis plant has proven to other parts of the world that desalination can be a clean, efficient and cost-effective process.
From the Paper
"Desalination is a mechanical process by which saltwater from oceans can be converted into drinking water for human consumption by removing the salt. There are three main mechanical processes of desalination commonly used today; electrodialysis reversal, thermal desalination, and reverse osmosis.
"Electrodialysis reversal is the most intricate and cost effective desalination system of the three commonly used processes. Electricity is used to ionicly charge the salt in the seawater molecules, and then it is passed through an ion permeable membrane filtering the charged salt molecules. On the other side of the membrane, the water is clean and safe to drink. This process is problematic because of its extensive use of electricity, which is expensive and sometimes unavailable."
| |
|
Earthquake Facts, 2008.
This paper is written as a speech on the topic of earthquakes.
1,133 words (approx. 4.5 pages), 3 sources, MLA, $ 39.95
»
Click here to show/hide summary
Abstract
The paper reveals that one earthquake is felt on our fragile planet every thirty seconds! The paper then describes how earthquakes happen, their costly and destructive results and how they are measured. The paper relates that while earthquakes cannot be predicted, it is possible for us to limit the damage and impact they have, by building structures using earthquake resistant designs and ensuring that the interiors of our buildings are safe from falling objects. The paper concludes that ultimately, what is important is to educate people about earthquake safety.
From the Paper
"One earthquake is felt on our fragile planet every thirty seconds. There is a 100% chance that somewhere, today, an earthquake is shaking the ground. We have no way of predicting how and when an earthquake will strike. We can only say that it might. No one can say for sure if the tremors that are felt will be enough to kill and wreak havoc. What we can be sure of is that earthquakes are perhaps the most powerful and destructive forces of nature. We should all know the facts and what if anything we can do to be prepared for such a catastrophe."
|
|
|
