The Principle Events In The Evolution Of The Earth Essays

The Principle Events In The Evolution Of The Earth Essays The Principle Events In The Evolution Of The Earth The Principle Events in the Evolution of the Earth's Atmosphere The literal translation of the word atmosphere is sphere of vapors. The Earth's atmosphere is a protective sphere of vapors, or air that surrounds the Earth and provides it with a layer of insulation from the harmful rays of the sun. It is a vital part of the Earth, and has changed dramatically since the beginning of time. The earth's atmosphere has gradually changed since the Earth's birth approximately 4.6 million years ago. In the beginning, the Earth's composition was very different that how it exists today. A long time ago the Earth's atmosphere was very similar to today's Venus and Mar's atmosphere. It had about 95% carbon dioxide, 2-3% nitrogen, and very little, less than 1% oxygen. Today the Earth contains 79% nitrogen, 21% oxygen, and 3% water vapor. It is evident that there were many events that happened over billions of years that have contributed to this change in the Earth's atmosphere. The Earth had developed so drastically because of the tremendous dust and gas cloud within the Milky Way galaxy. The Earth grew larger as huge meteorites hit it, and the surface was covered with dust. Volcanoes began to form and emitted lava, ash, and most importantly gases. Carbon dioxide, water vapor, and nitrogen were released into the atmosphere from the volcanoes. This process is called outgassing, and took place within the first million years or so of the Earth's formation. Then, about 4 billion years ago, the planet cooled, and the outgassed water vapors condensed into clouds. It rained and produced the oceans, and even enough to cover 95% of the Earth. In addition, because it rained, there was less carbon dioxide in the atmosphere. The carbon dioxide was lost over billion of years, as the ocean formed there was a chemical reaction in which carbon dioxide and water formed carbonic acid. It is shown in the equation CO2 + H2O = H2CO3. The carbonic acid dissolved oceanic rock into sand, silt, and mud. It is evident because of this geochemical process occurred there is more carbon in the rocks and minerals and there is less in the Earths atmosphere. The Earths first ever oxygen emerged about two millions years ago because of ultraviolet radiation. The water in the Earths atmosphere was split into oxygen and hydrogen because of the ultraviolet radiation from the sun. The equation for this process is UV-* 2H20 -* 2H2 + O2. The first ever oxygen is from the ultraviolet radiation that occurred in the Earths atmosphere. It is interesting to note that 600 million years ago only about 1% of the Earths atmosphere was oxygen. Significant quantities of oxygen did not begin until plants arrived on the scene. The percentage of oxygen increased when plant life evolved and photosynthesis began to happen on the Earth. The first ever plants were blue-green algae, which lived the Earths oceans. Plants used sunlight, water, and carbon dioxide to make their food in a process called photosynthesis. The process of photosynthesis can be easily seen in the equation 6CO2 + 6H2O = C6H12O6 + O2. The plants breathe in carbon dioxide and then release oxygen during photosynthesis, within 500 million years oxygen was the second largest part of the atmosphere after nitrogen. As oxygen became a greater part of the atmosphere the ozone shield emerged. The shield was formed when solar ultraviolet radiation forces the reaction for oxygen to form ozone, also known as 03. The ozone protects the Earth and its inhabitants from the harmful radiation from the sun. In conclusion, the Earths atmosphere has changed dramatically since the Earths origin about 4.6 billion years ago. There are many factors that contributed to this change over time. By getting a better understanding of our Earths atmosphere we can use in many useful ways. We can use this knowledge of the atmosphere for a worthy cause in many areas of science and greatly benefit from it.

Climate Change and Its Impact on Health Essay Example | Topics and Well Written Essays - 3500 words

Climate Change and Its Impact on Health - Essay Example Solar radiation powers the climate system. Here we are trying to explain the factors, which are affecting our climate change, and how the human activities are affecting the climate mostly in negative way. Further we will try to understand how the global warming the most visible aspect of climate change affects our whole climate system including humans worldwide. Finally we will discuss the ill effects of these climatic changes on human health as a whole. Apart from environmental perspective we would discuss this phenomenon on the basis of social and economical development and how we can manage these changes effectively and equitably. Key-words: Global warming, Current Situation Analysis (CSA), Qualitative Research Methodology (QRM), Focus Group Discussions, In Depth Interviews, Key Informant Interview, questionnaire, Free Listing, Green House Gases, Emissions. Introduction: There can be no clearer illustration of the need for human beings to act globally than the issues raised by the impact of human activity on our atmosphere. That we all share the same planet came to our attention in a particularly pressing way in the 1970's when scientists discovered that the use of chlorofluorocarbons (CFC's) threatens the ozone layer shielding the surface of our planet from the full force of the Sun 's ultraviolet radiation. Damage to that protective shield would cause cancer rates to rise sharply and could have other effects, for example, on the growth of algae. Getting rid of CFC's has turned out to be just the curtain raiser; the main event is climate change, or global warming. Climate change is a very different matter. The scientific evidence that human activities are changing the climate of our planet has been studied by a working group of the Intergovernmental Panel On Climate Change (IPCC), an international scientific body intended to provide p olicymakers with an authoritative view of climate change and its causes. The Third IPCC report (2001) finds that our planet has shown clear signs of warming over the past century. The 1990's were the hottest decade, and 1998 the hottest year, recorded year the 140 years for which meteorological records have been kept. In fact, nine of the hottest years during this period have occurred since 1990, and temperatures are now rising at three times the rate of early 1900's ("This year was the 2nd Hottest, confirming a Trend, UN says", New York times, 19 December 2001,). Sea levels have risen by between 10 to 20 centimeters over the past century. Since 1960's snow and ice cover has decreased by about 10% Ad Mountain glaciers are in retreat everywhere except near the poles. Now due to climate change, lots of poor nations and their populations will face drastic situations. In 1991, a cyclone hit the coast of Bangladesh, coinciding with high tides that left 10 million people hopeless and kill ed 1, 39,000. Most of these people were living on mudflats in the deltas. As many as 70 million people could be affected in Bangladesh, and a similar number in china.

The book lord of the rings are directed towards demographic for Essay

The book lord of the rings are directed towards demographic for children that believe in fantasy, in the other hand lord of the rings in the movies are action filled and more for adults - Essay Example .R.R Tolkien’s novel called â€Å"Tolkien Gateway† had described the book, Lord of the Ring, and corrected about the misconception of its being a trilogy: J.R.R. Tolkiens epic high-fantasy work The Lord of the Rings. Although widely mistaken as a trilogy or series, it is only one book, although usually published in three separate volumes. The original publishers split it into three parts because they felt that no-one would want, or be able to afford, to purchase a volume as large as the one Tolkien had written. However, some editions have since een published as a single book, the way the author intended. Picking up a few decades after The Hobbit left off, The Lord of the Rings seems to presuppose that the reader is already familiar with the previous book – its opening sentence leaps straight into a description of Bilbo Baggins 111th birthday party preparations, without bothering to introduce the character (Bilbo was the main character for The Hobbit). However, it is quite easy to get into the swing of the books, as they introduce all the other characters well. The sequel picks up on what was only a minor prop, Gollums Ring, in The Hobbit, and reveals it to be an object of enormous power and evil, the One Ring itself, forged by the Dark Lord Sauron. Although the book has many plot threads, the primary one follows the journey of Frodo Baggins, Bilbos nephew, as he and his companions attempt to destroy the Ring. (Tolkien Gateway 2011) Director, Peter Jackson fulfills his lifelong dream of transforming author J.R.R. Tolkiens best-selling fantasy epic into a three-part motion picture that begins with this holiday 2001 release. Elijah Wood stars as Frodo Baggins, a Hobbit resident of the medieval "Middle-earth" who discovers that a ring bequeathed to him by beloved relative and benefactor Bilbo (Ian Holm) is in fact the "One Ring," a device that will allow its master to manipulate dark powers and enslave the world. Frodo is charged by the wizard Gandalf (Ian

Definition Courage Essay Example for Free

Definition Courage Essay All of us trust the dictionary to give us the full understanding of a word we do not know. In this aspect, it is insufficient when it describes courage. While it defines physical courage, it omits inner courage which can be argued to be much more valuable to posses. Webster’s New World Dictionary describes courage as â€Å"an attitude of facing and dealing with anything recognized as dangerous, difficult or painful, instead of withdrawing from it†. Courage is not the ability to be brave or to laugh in the face of danger. Courage is not risking your life for justice. Courage is not a person who agrees to fight, but he who can stand up against it. Courage is not something you can define entirely, and therefore can vary between each person. It can be said that a little girl who ventures out on her bike for the first time displays as much courage as a man jumping into a lake to save a drowning woman, knowing he cannot swim. Courage is a state of mind that enables a person to overcome fear, pain, danger or hardship. Although different from one another, all aspects of courage involve taking risks. Physical courage is facing your fears of possible bodily harm. A fireman rushing into a burning building, a woman running across thin- ice to save a child that has just fallen through, an officer charging into a building to save a hostage. These are all examples of physical courage. Mental courage is standing up to your phobias. While some fear heights, I myself fear speaking in front of a large audience. A son who overcomes his fear of flying to be by his dying mothers side is mental courage that cannot be fully measured or explained. Mental courage is the ability to overcome tragedy and to move forward in the face of sheer defeat. Mental courage is a man finding out he has a brain tumor, and still cherishing and living life to the fullest. Mental courage is taking care of your brother and sister following the death of their parents. The word courage comes from the Latin word cor, meaning heart. It derives from the belief that all feelings begin in the heart. The definitions given to all of us do not suffice because they lack depth and clarity. Mental courage, while not mentioned, and not defined, is portrayed in all of us on a daily basis; and should be along-side physical courage in the references we rely on.

The African World-view in Soyinkas Death and the Kings Horseman Essay

The African world-view in Soyinka's Death and the King's Horseman In his play, Death and the King's Horseman, Wole Soyinka uses certain literary forms and devices to intermix Yoruba culture and a predominantly European dramatic form to create a play easily understood by the audience, but that allows the introduction of a foreign influence. These devices include the use of a songlike quality in dialogue and the telling of stories, the use of personification and metaphor to give an exotic quality to the play, and the use of certain elements to provide the reader with a sense of the mystic traditions that are Africa. These Yoruban elements are best explained by the character Jane with "You talk! Your people with your long-winded, round-about way of making conversation" (1171), and the character Pilkings with "What is she saying now? Christ! Must your people forever speak in riddles?" (1176). The use of rhythm and a songlike quality in the dialogue and the telling of stories is used by Soyinka to transport the reader to another place. In the following excerpt, the... The African World-view in Soyinka's Death and the King's Horseman Essay The African world-view in Soyinka's Death and the King's Horseman In his play, Death and the King's Horseman, Wole Soyinka uses certain literary forms and devices to intermix Yoruba culture and a predominantly European dramatic form to create a play easily understood by the audience, but that allows the introduction of a foreign influence. These devices include the use of a songlike quality in dialogue and the telling of stories, the use of personification and metaphor to give an exotic quality to the play, and the use of certain elements to provide the reader with a sense of the mystic traditions that are Africa. These Yoruban elements are best explained by the character Jane with "You talk! Your people with your long-winded, round-about way of making conversation" (1171), and the character Pilkings with "What is she saying now? Christ! Must your people forever speak in riddles?" (1176). The use of rhythm and a songlike quality in the dialogue and the telling of stories is used by Soyinka to transport the reader to another place. In the following excerpt, the...

Columnist Analysis: Mitch Albom

Kristen Chesmore Hall AP English Lang 3-3-13 Name of Columnist: Mitch Albom Title of Column: One Day, Coming out Won't Mean Leaving. Publication: Detroit Free Press Access of Info: March 2, 2013 Albom, Mitch. â€Å"One Day, Coming out Won't Mean Leaving. † Detroit Free Press 17 Feb. 2013: n. pag. Web. 2 Mar. 2013. Summary: Robbie Rogers is a talented 25 year-old soccer player from southern California. He won the NCAA championship and has played on the U. S. national soccer team. Needless to say, soccer was his life and he was very successful.On February 5th, 2013 he came out to the public that he was gay. Almost immediately after he shared this news, he retired to discover himself away from soccer. He gained much support from fans, media and teammates, but none were able to convince him to keep playing soccer. Mitch Albom discusses this news in his column and the gives hope of a male professional sports player that is brave enough to admit to being gay, and stay to play the ga me for a change. Rhetorical Square: Audience: Alboms Audience would be those who are interested in the news of soccer and other professional sports leagues.He is also targeting men who are in those professional sports leagues and are gay, to be the first to admit to it publicly and continue to play. Persona: The author takes on the persona of a person who supports the gays and has hope for them to be able to be open about their sexual orientation. Purpose: The purpose of this column is to convince future and current gay professional athletes to publicly state their sexual orientation and not let fear or the judgment of others convince them to step away from their dreams.Argument: Albom argues that instead of being scared to be open about being gay, these professional athletes should overcome that fear and be a role model for others who want to be a professional athlete but are afraid that being themselves will get in the way of achieving their dreams. Rhetorical Devices: Albom start s this column with creating a picture of a young and very successful soccer player named Robbie. He does this by describing how young he is and how many major teams he has been on and major championships he has won.By creating this image for the audience it makes it more shocking that he threw all of that success away because he thought people would judge him after he openly admitted that he was gay. This is an appeal to pathos because the audience will sympathize with the story of a successful athlete pushed out of his sport from fear of what society would think of him. When he is describing how Rogers left his career he uses short chopped up sentences. By doing this he is showing how abrupt the decision was through sentence structure rather than verbally stating that his notice of leaving the sport was out of nowhere.This way the audience understands, visually, how shocking it was. Albom also uses direct quotes from Roger’s blog that exhibit how vulnerable and desperate he was. The quotes he uses include words like â€Å"fear†, â€Å"judgment† and â€Å"rejection† that have a negative connotation. These quotes appeal to pathos and make the audience sympathize with the soccer player that felt there was no other way to deal with this than to retire because he was so afraid of being treated differently. It makes his target, gay professional athletes, want to be the first to come out publicly and stay to play so that a situation like Roger’s doesn’t have to happen again.At the beginning and end of the column Albom describes the first man to be a publicly gay professional athlete. He describes him as â€Å"A brave man, a confident man†¦Ã¢â‚¬ , using positive adjectives that make this man seem admirable. This shows the audience that being openly gay and a person of higher power is a very respectable thing to be, not something that people show look down upon. This further convinces the audience to want to be honest w ith who they are. He also includes quotes from a 49ers football player, Chris Culliver, who as not afraid to show his homophobic side. The answers used from an interview that asked his opinion on if he had a teammate that was gay teammate were very bold and hateful. By using these quotes it is another appeal to pathos and is supposed to make the audience angry that someone would be so rude to someone over the sex that they are attracted to. it also makes the audience want more people to stand up for gay people and make society more accepting towards them. And ultimately that will start when the first male professional athlete publicly admits to being gay.

What Are Some Of The Indications For Induction Of Labor...

1) What are some of the indications for induction of labor? Answer: The induction of labor is indicated if the mother has certain conditions like diabetes mellitus, Chronic Obstructive Pulmonary Disease, kidney disease and hypertension. Labor is also induced if other conditions are present like preeclampsia, eclampsia, isoimmunization, if the membrane is ruptured prematurely, chorioamnionitis, death of the fetus, if the pregnancy is posterm, if the fetus does not have room for growth or if the fetal heart rate is not reassuring (Davidson, London, and Ladewig, 2012). 2) What are some of the different ways of inducing labor? Answer: There are many different methods to help induce labor. One includes application of prostaglandins hormones also known as Cervidil to the cervix to help promote dilation and thinning (Davidson, London, and Ladewig, 2012). Another method is providing IV Pitocin, which is the synthetic form of oxytocin to the mother. This medication is used to help increase both the strength and the rate of the contractions and it acts directly on the uterine muscles (Davidson, London, and Ladewig, 2012). Another method done by providers involves the separation of the amniotic membrane from the uterus this in turn helps to release prostaglandins, which promote labor (Davidson, London, and Ladewig, 2012). 3) What nursing interventions must be done prior to starting induction of labor? Answer: Prior to starting induction of labor it is essential to first make sureShow MoreRelatedIn Many Cases, A Patient Increases Their Odds Of A Cesarean1503 Words   |  7 Pageswere electively induced (Luthy et al., 2004). Multiple studies have looked at nulliparous versus multiparous women and have found that elective inductions do not look to increase the odds of a woman needing a cesarean section in multiparous women. 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Complete either a) or b) 5 a) Discuss what is involved in the person specification phase of job analysis 5 b) Explain what competency frameworks are, and what what competences are typically included in such frameworks. 7 4. Complete either a) or b) 8 a) Explain either 4 interview errors and biases you are familiar with. 8 a) Discuss what points should be considered to ensure that an assessment centreRead More The Shift in Abortion Policy in the 1800s Essay5421 Words   |  22 Pagessave these women from a life of destitution and were sympathetic to their plight. While they did not encourage abortion, they would turn a blind eye (Mohr p. 88-89). This attitude would change as the perception of who were having abortions and for what reasons changed. After 1840, the number of abortions drastically increased, and the majority of women aborting were upper and middle class, married, and Protestant (Mohr p. 88). 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